diff --git a/README.md b/README.md
index 1ded254..144ffaa 100644
--- a/README.md
+++ b/README.md
@@ -249,6 +249,8 @@ import "github.com/duke-git/lancet/v2/convertor"
 -   **<big>DeepClone</big>** : creates a deep copy of passed item, can't clone unexported field of struct.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/convertor.md#DeepClone)]
     [[play](https://go.dev/play/p/j4DP5dquxnk)]
+-   **<big>CopyProperties</big>** : copies each field from the source struct into the destination struct.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/convertor.md#CopyProperties)]
 
 
 ### 5. Cryptor package is for data encryption and decryption.
@@ -606,12 +608,24 @@ import "github.com/duke-git/lancet/v2/maputil"
 -   **<big>Filter</big>** : iterates over map, return a new map contains all key and value pairs pass the predicate function.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#Filter)]
     [[play](https://go.dev/play/p/fSvF3wxuNG7)]
+-   **<big>FilterByKeys</big>** : iterates over map, return a new map whose keys are all given keys
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#FilterByKeys)]
+-   **<big>FilterByValues</big>** : iterates over map, return a new map whose values are all given values.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#FilterByValues)]
+-   **<big>OmitBy</big>** : the opposite of Filter, removes all the map elements for which the predicate function returns true.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#OmitBy)]
+-   **<big>OmitByKeys</big>** : the opposite of FilterByKeys, extracts all the map elements which keys are not omitted.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#OmitByKeys)]
+-   **<big>OmitByValues</big>** : the opposite of FilterByValues. remov all elements whose value are in the give slice.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#OmitByValues)]
 -   **<big>Intersect</big>** : iterates over maps, return a new map of key and value pairs in all given maps.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#Intersect)]
     [[play](https://go.dev/play/p/Zld0oj3sjcC)]
 -   **<big>Keys</big>** : returns a slice of the map's keys.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#Keys)]
     [[play](https://go.dev/play/p/xNB5bTb97Wd)]
+-   **<big>KeysBy</big>** : creates a slice whose element is the result of function mapper invoked by every map's key.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#KeysBy)]
 -   **<big>Merge</big>** : merge maps, next key will overwrite previous key.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#Merge)]
     [[play](https://go.dev/play/p/H95LENF1uB-)]
@@ -621,6 +635,18 @@ import "github.com/duke-git/lancet/v2/maputil"
 -   **<big>Values</big>** : returns a slice of the map's values.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#Values)]
     [[play](https://go.dev/play/p/CBKdUc5FTW6)]
+-   **<big>ValuesBy</big>** : creates a slice whose element is the result of function mapper invoked by every map's value.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#ValuesBy)]
+-   **<big>MapKeys</big>** : transforms a map to other type map by manipulating it's keys.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#MapKeys)]
+-   **<big>MapValues</big>** : transforms a map to other type map by manipulating it's values.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#MapValues)]
+-   **<big>Entries</big>** : transforms a map into array of key/value pairs.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#Entries)]
+-   **<big>FromEntries</big>** : creates a map based on a slice of key/value pairs.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#FromEntries)]
+-   **<big>Transform</big>** : transform a map to another type map.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#Transform)]
 -   **<big>IsDisjoint</big>** : check two map are disjoint if they have no keys in common.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil.md#IsDisjoint)]
     [[play](https://go.dev/play/p/N9qgYg_Ho6f)]
@@ -806,6 +832,8 @@ import "github.com/duke-git/lancet/v2/slice"
 -   **<big>Contain</big>** : check if the value is in the slice or not.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#Contain)]
     [[play](https://go.dev/play/p/_454yEHcNjf)]
+-   **<big>ContainBy</big>** : returns true if predicate function return true.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#ContainBy)]
 -   **<big>ContainSubSlice</big>** : check if the slice contain a given subslice or not.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#ContainSubSlice)]
     [[play](https://go.dev/play/p/bcuQ3UT6Sev)]
@@ -860,6 +888,8 @@ import "github.com/duke-git/lancet/v2/slice"
 -   **<big>Filter</big>** : iterates over elements of slice, returning an slice of all elements pass the predicate function.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#Filter)]
     [[play](https://go.dev/play/p/SdPna-7qK4T)]
+-   **<big>FilterMap</big>** : returns a slice which apply both filtering and mapping to the given slice.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#FilterMap)]
 -   **<big>Find</big>** : iterates over elements of slice, returning the first one that passes a truth test on predicate function.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#Find)]
     [[play](https://go.dev/play/p/CBKeBoHVLgq)]
@@ -872,6 +902,8 @@ import "github.com/duke-git/lancet/v2/slice"
 -   **<big>FlattenDeep</big>** : flattens slice recursive to one level.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#FlattenDeep)]
     [[play](https://go.dev/play/p/yjYNHPyCFaF)]
+-   **<big>FlatMap</big>** : manipulates a slice and transforms and flattens it to a slice of another type.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#FlatMap)]
 -   **<big>ForEach</big>** : iterates over elements of slice and invokes function for each element.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#ForEach)]
     [[play](https://go.dev/play/p/DrPaa4YsHRF)]
@@ -1021,6 +1053,8 @@ import "github.com/duke-git/lancet/v2/strutil"
 -   **<big>UpperFirst</big>** : converts the first character of string to upper case.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#UpperFirst)]
     [[play](https://go.dev/play/p/sBbBxRbs8MM)]
+-   **<big>Pad</big>** : pads string on the left and right side if it's shorter than size.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#Pad)]
 -   **<big>PadEnd</big>** : pads string with given characters on the right side if it's shorter than limit size. Padding characters are truncated if they exceed size.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#PadEnd)]
     [[play](https://go.dev/play/p/9xP8rN0vz--)]
@@ -1048,6 +1082,10 @@ import "github.com/duke-git/lancet/v2/strutil"
 -   **<big>Unwrap</big>** : unwrap a given string from anther string. will change source string.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#Unwrap)]
     [[play](https://go.dev/play/p/Ec2q4BzCpG-)]
+-   **<big>SplitWords</big>** : splits a string into words, word only contains alphabetic characters.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#SplitWords)]
+-   **<big>WordCount</big>** : return the number of meaningful word of a string, word only contains alphabetic characters.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil.md#WordCount)]
 
 ### 19. System package contain some functions about os, runtime, shell command.
 
diff --git a/README_zh-CN.md b/README_zh-CN.md
index fa721b5..3d03f8b 100644
--- a/README_zh-CN.md
+++ b/README_zh-CN.md
@@ -248,7 +248,8 @@ import "github.com/duke-git/lancet/v2/convertor"
 -   **<big>DeepClone</big>** : 创建一个传入值的深拷贝, 无法克隆结构体的非导出字段。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/convertor_zh-CN.md#DeepClone)]
     [[play](https://go.dev/play/p/j4DP5dquxnk)]
-
+-   **<big>CopyProperties</big>** : 拷贝不同结构体之间的同名字段。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/convertor_zh-CN.md#CopyProperties)]
 
 
 ### 5. cryptor 加密包支持数据加密和解密，获取 md5，hash 值。支持 base64, md5, hmac, aes, des, rsa。
@@ -610,12 +611,24 @@ import "github.com/duke-git/lancet/v2/maputil"
 -   **<big>Filter</big>** : 迭代 map 中的每对 key 和 value，返回 map，其中的 key 和 value 符合 predicate 函数。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN.md#Filter)]
     [[play](https://go.dev/play/p/fSvF3wxuNG7)]
+-   **<big>FilterByKeys</big>** : 迭代map, 返回一个新map，其key都是给定的key值。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#FilterByKeys)]
+-   **<big>FilterByValues</big>** : 迭代map, 返回一个新map，其value都是给定的value值。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#FilterByValues)]
+-   **<big>OmitBy</big>** : Filter的反向操作, 迭代map中的每对key和value, 删除符合predicate函数的key, value, 返回新map。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#OmitBy)]
+-   **<big>OmitByKeys</big>** : FilterByKeys的反向操作, 迭代map, 返回一个新map，其key不包括给定的key值。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#OmitByKeys)]
+-   **<big>OmitByValues</big>** : FilterByValues的反向操作, 迭代map, 返回一个新map，其value不包括给定的value值。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#OmitByValues)]
 -   **<big>Intersect</big>** : 多个 map 的交集操作。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN.md#Intersect)]
     [[play](https://go.dev/play/p/Zld0oj3sjcC)]
 -   **<big>Keys</big>** : 返回 map 中所有 key 组成的切片。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN.md#Keys)]
     [[play](https://go.dev/play/p/xNB5bTb97Wd)]
+-   **<big>KeysBy</big>** : 创建一个切片，其元素是每个map的key调用mapper函数的结果。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#KeysBy)]
 -   **<big>Merge</big>** : 合并多个 map, 相同的 key 会被之后的 key 覆盖。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN.md#Merge)]
     [[play](https://go.dev/play/p/H95LENF1uB-)]
@@ -625,7 +638,19 @@ import "github.com/duke-git/lancet/v2/maputil"
 -   **<big>Values</big>** : 返回 map 中所有 values 组成的切片
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN.md#Values)]
     [[play](https://go.dev/play/p/CBKdUc5FTW6)]
--   **<big>IsDisjoint</big>** : 验证两个 map 是否具有不同的 key。
+-   **<big>ValuesBy</big>** : 创建一个切片，其元素是每个map的value调用mapper函数的结果。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#ValuesBy)]
+-   **<big>MapKeys</big>** : 操作map的每个key，然后转为新的map。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#MapKeys)]
+-   **<big>MapValues</big>** : 操作map的每个value，然后转为新的map。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#MapValues)]
+-   **<big>Entries</big>** : 将map转换为键/值对切片。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#Entries)]
+-   **<big>FromEntries</big>** : 基于键/值对的切片创建map。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#FromEntries)]
+-   **<big>Transform</big>** : 将map转换为其他类型的map。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN#Transform)]
+-   **<big>IsDisjoint</big>** : 验证两个map是否具有不同的key。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/maputil_zh-CN.md#IsDisjoint)]
     [[play](https://go.dev/play/p/N9qgYg_Ho6f)]
 
@@ -814,6 +839,8 @@ import "github.com/duke-git/lancet/v2/slice"
 -   **<big>Contain</big>** : 判断slice是否包含value。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#Contain)]
     [[play](https://go.dev/play/p/_454yEHcNjf)]
+-   **<big>ContainBy</big>** : 根据predicate函数判断切片是否包含某个值。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#ContainBy)]
 -   **<big>ContainSubSlice</big>** : 判断slice是否包含subslice。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#ContainSubSlice)]
     [[play](https://go.dev/play/p/bcuQ3UT6Sev)]
@@ -868,6 +895,8 @@ import "github.com/duke-git/lancet/v2/slice"
 -   **<big>Filter</big>** : 返回切片中通过predicate函数真值测试的所有元素。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#Filter)]
     [[play](https://go.dev/play/p/SdPna-7qK4T)]
+-   **<big>FilterMap</big>** : 返回一个将filter和map操作应用于给定切片的切片。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#FilterMap)]
 -   **<big>Find</big>** : 遍历切片的元素，返回第一个通过predicate函数真值测试的元素。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#Find)]
     [[play](https://go.dev/play/p/CBKeBoHVLgq)]
@@ -880,6 +909,8 @@ import "github.com/duke-git/lancet/v2/slice"
 -   **<big>FlattenDeep</big>** : 将多维切片递归展平到一层。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#FlattenDeep)]
     [[play](https://go.dev/play/p/yjYNHPyCFaF)]
+-   **<big>FlatMap</big>** : 将切片转换为其它类型切片。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#FlatMap)]
 -   **<big>ForEach</big>** : 遍历切片的元素并为每个元素调用iteratee函数。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#ForEach)]
     [[play](https://go.dev/play/p/DrPaa4YsHRF)]
@@ -1031,6 +1062,8 @@ import "github.com/duke-git/lancet/v2/strutil"
 -   **<big>UpperFirst</big>** : 将字符串的第一个字符转换为大写形式。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil_zh-CN.md#UpperFirst)]
     [[play](https://go.dev/play/p/sBbBxRbs8MM)]
+-   **<big>Pad</big>** : 如果字符串长度短于size，则在左右两侧填充字符串。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil_zh-CN.md#Pad)]
 -   **<big>PadEnd</big>** : 如果字符串短于限制大小，则在右侧用给定字符填充字符串。 如果填充字符超出大小，它们将被截断。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil_zh-CN.md#PadEnd)]
     [[play](https://go.dev/play/p/9xP8rN0vz--)]
@@ -1058,6 +1091,10 @@ import "github.com/duke-git/lancet/v2/strutil"
 -   **<big>Unwrap</big>** : 从另一个字符串中解开一个给定的字符串。 将更改源字符串。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil_zh-CN.md#Unwrap)]
     [[play](https://go.dev/play/p/Ec2q4BzCpG-)]
+-   **<big>SplitWords</big>** : 将字符串拆分为单词，只支持字母字符单词。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil_zh-CN.md#SplitWords)]
+-   **<big>WordCount</big>** : 返回有意义单词的数量，只支持字母字符单词。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/strutil_zh-CN.md#WordCount)]
 
 ### 18. system 包含 os, runtime, shell command 的相关函数。
 
diff --git a/docs/maputil_zh-CN.md b/docs/maputil_zh-CN.md
index 12d5950..84a713d 100644
--- a/docs/maputil_zh-CN.md
+++ b/docs/maputil_zh-CN.md
@@ -90,7 +90,7 @@ func main() {
 
 ### <span id="Filter">Filter</span>
 
-<p>迭代map中的每对key和value, 返回符合predicate函数的key, value</p>
+<p>迭代map中的每对key和value, 返回符合predicate函数的key, value。</p>
 
 <b>函数签名:</b>
 
@@ -135,7 +135,7 @@ func main() {
 
 ### <span id="FilterByKeys">FilterByKeys</span>
 
-<p>迭代map, 返回一个新map，其key都是给定的key值.</p>
+<p>迭代map, 返回一个新map，其key都是给定的key值。</p>
 
 <b>函数签名:</b>
 
@@ -174,7 +174,7 @@ func main() {
 
 ### <span id="FilterByValues">FilterByValues</span>
 
-<p>迭代map, 返回一个新map，其value都是给定的value值.</p>
+<p>迭代map, 返回一个新map，其value都是给定的value值。</p>
 
 <b>函数签名:</b>
 
@@ -213,7 +213,7 @@ func main() {
 
 ### <span id="OmitBy">OmitBy</span>
 
-<p>Filter的反向操作, 迭代map中的每对key和value, 删除符合predicate函数的key, value, 返回新map</p>
+<p>Filter的反向操作, 迭代map中的每对key和value, 删除符合predicate函数的key, value, 返回新map。</p>
 
 <b>函数签名:</b>
 
@@ -255,7 +255,7 @@ func main() {
 
 ### <span id="OmitByKeys">OmitByKeys</span>
 
-<p>FilterByKeys的反向操作, 迭代map, 返回一个新map，其key不包括给定的key值.</p>
+<p>FilterByKeys的反向操作, 迭代map, 返回一个新map，其key不包括给定的key值。</p>
 
 <b>函数签名:</b>
 
@@ -294,7 +294,7 @@ func main() {
 
 ### <span id="OmitByValues">OmitByValues</span>
 
-<p>FilterByValues的反向操作, 迭代map, 返回一个新map，其value不包括给定的value值.</p>
+<p>FilterByValues的反向操作, 迭代map, 返回一个新map，其value不包括给定的value值。</p>
 
 <b>函数签名:</b>