diff --git a/problems/0098.验证二叉搜索树.md b/problems/0098.验证二叉搜索树.md
index bb38ae35..262ad18c 100644
--- a/problems/0098.验证二叉搜索树.md
+++ b/problems/0098.验证二叉搜索树.md
@@ -639,6 +639,29 @@ object Solution {
 }
 ```
 
+## rust
+
+递归：
+
+```rust
+impl Solution {
+    pub fn is_valid_bst(root: Option<Rc<RefCell<TreeNode>>>) -> bool {
+        Self::valid_bst(i64::MIN, i64::MAX, root)
+    }
+    pub fn valid_bst(low: i64, upper: i64, root: Option<Rc<RefCell<TreeNode>>>) -> bool {
+        if root.is_none() {
+            return true;
+        }
+        let root = root.as_ref().unwrap().borrow();
+        if root.val as i64 <= low || root.val as i64 >= upper {
+            return false;
+        }
+        Self::valid_bst(low, root.val as i64, root.left.clone())
+            && Self::valid_bst(root.val as i64, upper, root.right.clone())
+    }
+}
+```
+
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