diff --git a/src/AST/Statement/StatementInterface.php b/src/AST/Statement/StatementInterface.php
new file mode 100644
index 0000000..76a83bd
--- /dev/null
+++ b/src/AST/Statement/StatementInterface.php
@@ -0,0 +1,40 @@
+<?php
+/**
+ * @filename StatementInterface.php
+ * @author Jerry Yan <792602257@qq.com>
+ * @date 2021/2/22 13:56
+ */
+
+
+namespace JerryYan\DSL\AST\Statement;
+
+
+abstract class StatementInterface
+{
+    /** @var ?StatementInterface */
+    protected $parent;
+    /** @var ?StatementInterface */
+    protected $child;
+
+    /**
+     * @param StatementInterface|null $parent
+     * @author Jerry Yan <792602257@qq.com>
+     * @date 2021/3/16 9:49
+     */
+    public function setParent(?StatementInterface $parent): void
+    {
+        $this->parent = $parent;
+    }
+
+    /**
+     * @param StatementInterface|null $child
+     * @author Jerry Yan <792602257@qq.com>
+     * @date 2021/3/16 9:50
+     */
+    public function setChild(?StatementInterface $child): void
+    {
+        $this->child = $child;
+    }
+
+    abstract public function validate(): bool;
+}