diff --git a/.idea/.idea.Algorithm-FSharp/.idea/workspace.xml b/.idea/.idea.Algorithm-FSharp/.idea/workspace.xml
index 46c0a15..c9f4704 100644
--- a/.idea/.idea.Algorithm-FSharp/.idea/workspace.xml
+++ b/.idea/.idea.Algorithm-FSharp/.idea/workspace.xml
@@ -7,10 +7,11 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="32b2067c-6667-4162-834b-afaa5fbc533d" name="Changes" comment="">
+    <list default="true" id="32b2067c-6667-4162-834b-afaa5fbc533d" name="Changes" comment="施工阶段4：插入排序">
       <change afterPath="$PROJECT_DIR$/Algorithm-FSharp/IntersectionSort.fs" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/.idea.Algorithm-FSharp/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/.idea.Algorithm-FSharp/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/Algorithm-FSharp/Algorithm-FSharp.fsproj" beforeDir="false" afterPath="$PROJECT_DIR$/Algorithm-FSharp/Algorithm-FSharp.fsproj" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Algorithm-FSharp/TestList.fs" beforeDir="false" afterPath="$PROJECT_DIR$/Algorithm-FSharp/TestList.fs" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -98,6 +99,7 @@
       <workItem from="1660231505344" duration="3491000" />
       <workItem from="1660267756436" duration="7666000" />
       <workItem from="1660313412199" duration="3066000" />
+      <workItem from="1660475772512" duration="451000" />
     </task>
     <task id="LOCAL-00001" summary="施工阶段1 快速排序">
       <created>1660059459924</created>
@@ -141,7 +143,14 @@
       <option name="project" value="LOCAL" />
       <updated>1660279013996</updated>
     </task>
-    <option name="localTasksCounter" value="7" />
+    <task id="LOCAL-00007" summary="施工阶段4：插入排序">
+      <created>1660475901956</created>
+      <option name="number" value="00007" />
+      <option name="presentableId" value="LOCAL-00007" />
+      <option name="project" value="LOCAL" />
+      <updated>1660475901956</updated>
+    </task>
+    <option name="localTasksCounter" value="8" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -169,6 +178,7 @@
     <MESSAGE value="施工阶段2：归并排序" />
     <MESSAGE value="施工阶段3：选择排序" />
     <MESSAGE value="修正冗余语法，对应修改了相关注释" />
-    <option name="LAST_COMMIT_MESSAGE" value="修正冗余语法，对应修改了相关注释" />
+    <MESSAGE value="施工阶段4：插入排序" />
+    <option name="LAST_COMMIT_MESSAGE" value="施工阶段4：插入排序" />
   </component>
 </project>
\ No newline at end of file
diff --git a/Algorithm-FSharp.sln.DotSettings.user b/Algorithm-FSharp.sln.DotSettings.user
new file mode 100644
index 0000000..f591ba1
--- /dev/null
+++ b/Algorithm-FSharp.sln.DotSettings.user
@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:String x:Key="/Default/CodeInspection/PencilsConfiguration/ActualSeverity/@EntryValue">INFO</s:String></wpf:ResourceDictionary>
\ No newline at end of file
diff --git a/Algorithm-FSharp/Algorithm-FSharp.fsproj b/Algorithm-FSharp/Algorithm-FSharp.fsproj
index fe7fd8a..28d4142 100644
--- a/Algorithm-FSharp/Algorithm-FSharp.fsproj
+++ b/Algorithm-FSharp/Algorithm-FSharp.fsproj
@@ -8,6 +8,7 @@
 
     <ItemGroup>
         <Compile Include="TestList.fs" />
+        <Compile Include="IntersectionSort.fs" />
         <Compile Include="SelectionSort.fs" />
         <Compile Include="MergeSort.fs" />
         <Compile Include="QuickSort.fs" />
diff --git a/Algorithm-FSharp/IntersectionSort.fs b/Algorithm-FSharp/IntersectionSort.fs
new file mode 100644
index 0000000..28e1b8f
--- /dev/null
+++ b/Algorithm-FSharp/IntersectionSort.fs
@@ -0,0 +1,23 @@
+module Algorithm_FSharp.IntersectionSort
+// 将一个元素插入到有序序列中
+// intersect : 'a -> 'a list -> 'a list
+let rec intersect elem = function
+ | [] -> [elem] // 若序列为空，则无需比较，直接将元素插入到空序列中
+ | x::xs -> // 若序列不为空
+   match x < elem with // 取出序列中的第一个元素x，并将其与待插入元素比较
+    | true -> // 若x小于待插入元素
+      match xs with // 判断xs是否为空
+       | [] -> [elem; x] // 若xs为空，则直接插入到elem后部即可
+       | y::ys -> // 若xs不为空，则切割xs为有序序列的第二个元素y和剩余元素ys
+         match elem < y with // 再比较elem和y
+           | true -> [x; elem; y] @ ys // 若x < elem < y，则插入位点位于x、y之间
+           | false -> x::(xs |> intersect elem) // 若elem > y，则插入位点无法决议，递归插入
+    | false -> elem::x::xs // 若待插入元素小于序列中第一个元素，则直接插入到序列头部即可
+// 插入排序的F#实现
+// intersection_sort : 'a list -> 'a list
+let rec intersection_sort = function
+ | [] -> [] // 若待排序序列为空或只有一个元素，则它已经有序，直接返回
+ | [single] -> [single]
+ | x::xs -> xs // 若待排序序列有多个元素，则取出第一个元素
+                          |> intersection_sort // 递归对后续序列进行排序
+                          |> intersect x // 然后将第一个元素插入到序列中
\ No newline at end of file
diff --git a/Algorithm-FSharp/TestList.fs b/Algorithm-FSharp/TestList.fs
index 9416c1a..8f4d968 100644
--- a/Algorithm-FSharp/TestList.fs
+++ b/Algorithm-FSharp/TestList.fs
@@ -37,6 +37,9 @@ let myList = [
     512
     652
     111
+    233
+    233
+    233
     851
     98
     277