diff --git a/zhishu.java b/zhishu.java
new file mode 100644
index 0000000..1c0bc22
--- /dev/null
+++ b/zhishu.java
@@ -0,0 +1,17 @@
+public class zhishu{
+
+　　public double zhishu（double x，double y） {
+　　if (y==0)
+            return 1;
+        else if(y==1)
+            return x;
+        else if(oushu(y))
+            return zhishu(x*x,y/2);
+        else  return zhishu(x*x,(y-1)/2)*x
+　　}
+    private boolean oushu(int n){
+        if(n%2==0)
+            return true;
+        else return false;
+    }
+}
\ No newline at end of file