diff --git a/src/main/java/com/cool/hot100/backtracking/Num131.java b/src/main/java/com/cool/hot100/backtracking/Num131.java
new file mode 100644
index 0000000..380fb3d
--- /dev/null
+++ b/src/main/java/com/cool/hot100/backtracking/Num131.java
@@ -0,0 +1,52 @@
+package com.cool.hot100.backtracking;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Author: Cool
+ * @Date: 2024/09/11/23:12
+ * DayNumber 2
+ * Hard 2
+ * Level 5
+ */
+public class Num131 {
+
+
+    private List<List<String>> res = new ArrayList<>();
+    private List<String> list = new ArrayList<>();
+    private String str;
+
+    public List<List<String>> partition(String s) {
+        str = s;
+        dfs(0, 0);
+        return res;
+    }
+
+    private void dfs(int i, int start) {
+        if (i == str.length()) {
+            res.add(new ArrayList<>(list));
+            return;
+        }
+        if (i < str.length() - 1) {
+            dfs(i + 1, start);
+        }
+        if (isPalindrome(start, i)) {
+            list.add(str.substring(start, i + 1));
+            dfs(i + 1, i + 1);
+            list.remove(list.size() - 1);
+        }
+    }
+
+    private boolean isPalindrome(int left, int right) {
+        while (left < right) {
+            if (str.charAt(left++) != str.charAt(right--)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+}