diff --git a/SM3中的FF2和GG2函数.md b/SM3中的FF2和GG2函数.md
index d380400..c275e24 100644
--- a/SM3中的FF2和GG2函数.md
+++ b/SM3中的FF2和GG2函数.md
@@ -4,7 +4,7 @@ $GG2(X, Y, Z) = (X \land Y) \lor (\lnot X \land Z)$
 
 # 等价公式
 $FF2(X, Y, Z) = (X \land Y) \bigoplus (X \land Z) \bigoplus (Y \land Z)$  
-$GG2(X, Y, Z) = (Y \bigoplus Z) \land X \bigoplus Z$  
+$GG2(X, Y, Z) = (X \land Y) \bigoplus (\lnot X \land Z) = (X \land Y) \bigoplus ((1 \bigoplus X) \land Z) = (X \land Y) \bigoplus (X \land Z) \bigoplus Z = (Y \bigoplus Z) \land X \bigoplus Z$  
   
 GG2等价公式初次见于[Intel® Integrated Performance Primitives Cryptography](https://github.com/intel/ipp-crypto)
 # 应用