diff --git a/GA/fitness b/GA/fitness
new file mode 100644
index 0000000..953949e
--- /dev/null
+++ b/GA/fitness
@@ -0,0 +1,4 @@
+function fit=fitness(x)
+%求最大的，若是求最小则可以求倒
+fit=(x+10*sin(5*x)+7*cos(4*x));
+end