diff --git a/Sanchime.Functional/Core/Extensions/Option.cs b/Sanchime.Functional/Core/Extensions/Option.cs
index 18e99dd..d44b6cb 100644
--- a/Sanchime.Functional/Core/Extensions/Option.cs
+++ b/Sanchime.Functional/Core/Extensions/Option.cs
@@ -77,6 +77,22 @@ public static class OptionExtension
     public static Option<T> OrElse<T>(this Option<T> left, Func<Option<T>> right)
         => left.Match(() => right(), (_) => left);
 
+    #region Linq式
+
+    public static Option<R> Select<T, R>(this Option<T> source, Func<T, R> mapping)
+        => source.Map(mapping);
+
+    public static Option<T> Where<T, R>(this Option<T> source, Func<T, bool> predicate)
+        => source.Match(() => Option.None, (val) => predicate(val) ? source : Option.None);
+
+    public static Option<RR> SelectMany<T, R, RR>(this Option<T> source, Func<T, Option<R>> binding, Func<T, R, RR> project)
+        => source.Match(
+            None: () => Option.None, 
+            Some: (val) => binding(val).Match(
+                None: () => Option.None, 
+                Some: (res) => Option.Some(project(val, res))));
+
+    #endregion
     
     
 }