diff --git a/Sanchime.Functional/Extensions/Dictionary.cs b/Sanchime.Functional/Extensions/Dictionary.cs
new file mode 100644
index 0000000..dac608d
--- /dev/null
+++ b/Sanchime.Functional/Extensions/Dictionary.cs
@@ -0,0 +1,12 @@
+using Sanchime.Functional.Products;
+
+namespace Sanchime.Functional.Extensions;
+
+/// <summary>
+/// 字典扩展
+/// </summary>
+public static class DictionaryExtension
+{
+    public static Option<T> Lookup<K, T>(this Dictionary<K, T> dictionary, K key)  where K: notnull
+        => dictionary.TryGetValue(key, out T? value) ? Option.Some(value) : Option.None;
+}