diff --git a/GA/mutation b/GA/mutation
new file mode 100644
index 0000000..66c82ab
--- /dev/null
+++ b/GA/mutation
@@ -0,0 +1,12 @@
+function y= mutation(n,MutateRate,x)
+%n为染色体长度
+%MutataRate为变异概率
+%x为待变异染色体
+rate=rand;    %随机概率判断是否变异
+if rate<=MutateRate
+    mutate_pos=floor(rand*n+1);    %产生一个变异位置
+    x(mutate_pos)=floor(rand+1);  %bianyi 
+end
+y=x;
+end
+