diff --git a/src/com/gatsby/_449SerializeAndDeserializeBST.java b/src/com/gatsby/_449SerializeAndDeserializeBST.java
new file mode 100644
index 0000000..f8bee99
--- /dev/null
+++ b/src/com/gatsby/_449SerializeAndDeserializeBST.java
@@ -0,0 +1,68 @@
+package com.gatsby;
+
+import java.util.ArrayDeque;
+import java.util.LinkedList;
+import java.util.Queue;
+
+/**
+ * @classname _449SerializeAndDeserializeBST
+ * @description:
+ * @author: bgm
+ * @create: 2022/9/30
+ **/
+
+class Codec {
+    private TreeNode root;
+
+    public String serialize(TreeNode root) {
+        this.root = root;
+        return "";
+    }
+
+    public TreeNode root(String data) {
+        return root;
+    }
+}
+
+public class _449SerializeAndDeserializeBST {
+    public String serialize(TreeNode root) {
+        if (root == null) {
+            return "#";
+        }
+        Queue<TreeNode> queue = new ArrayDeque<>();
+        queue.add(root);
+        StringBuilder stringBuilder = new StringBuilder();
+        while (queue.size() > 0) {
+            TreeNode node = queue.poll();
+            stringBuilder.append("#");
+            if (node != null) {
+                queue.add(root.left);
+                queue.add(root.right);
+                stringBuilder.append(node.val);
+            }
+        }
+        return stringBuilder.toString();
+    }
+
+    public TreeNode deserialize(String data) {
+        if (data.equals("#")) {
+            return null;
+        }
+        String s[] = data.split("#", -1);
+        TreeNode ans = new TreeNode(Integer.parseInt(s[1]));
+        Queue<TreeNode> q = new LinkedList<>();
+        q.add(ans);
+        for (int i = 3; i < s.length; i += 2) {
+            TreeNode t = q.poll();
+            if (s[i - 1].length() > 0) {
+                t.left = new TreeNode(Integer.parseInt(s[i - 1]));
+                q.add(t.left);
+            }
+            if (s[i].length() > 0) {
+                t.right = new TreeNode(Integer.parseInt(s[i]));
+                q.add(t.right);
+            }
+        }
+        return ans;
+    }
+}