diff --git a/a8/lisp.h b/a8/lisp.h
new file mode 100644
index 0000000..9e3d67f
--- /dev/null
+++ b/a8/lisp.h
@@ -0,0 +1,61 @@
+#pragma once
+
+/*
+  数据类型
+  符号: symbol
+  列表: list
+  原子: atom
+ */
+namespace a8
+{
+
+    namespace lisp
+    {
+
+        struct List
+        {
+            std::vector<std::shared_ptr<Value>> elements;
+        };
+
+        struct Atom
+        {
+            double val = 0;
+        };
+
+        struct Symbol
+        {
+            std::string name;
+        };
+
+        struct Value
+        {
+            int value_type = 0;
+            std::shared_ptr<Atom> atom;
+            std::shared_ptr<List> list;
+        }
+
+        class Scope
+        {
+        private:
+            std::map<std::string, Value> vars_;
+            std::shared_ptr<scope> outer_;
+        };
+
+        class Expr
+        {
+        public:
+
+            bool Compile(const std::string& script);
+            std::shared_ptr<List> Eval();
+
+            std::shared_ptr<List> GetExprList() { return list_; };
+
+        private:
+
+            std::shared_ptr<List> list_;
+
+        };
+
+    }
+
+}