diff --git a/src/main/java/org/dromara/easyai/function/Sigmoid.java b/src/main/java/org/dromara/easyai/function/Sigmoid.java
new file mode 100644
index 0000000..ff6f51f
--- /dev/null
+++ b/src/main/java/org/dromara/easyai/function/Sigmoid.java
@@ -0,0 +1,22 @@
+package org.dromara.easyai.function;
+
+
+import org.dromara.easyai.i.ActiveFunction;
+
+/**
+ * @param
+ * @DATA
+ * @Author LiDaPeng
+ * @Description
+ */
+public class Sigmoid implements ActiveFunction {
+    @Override
+    public float function(float x) {
+        return 1 / (1 + (float)Math.exp(-x));
+    }
+
+    @Override
+    public float functionG(float out) {
+        return out * (1 - out);
+    }
+}