diff --git a/src/main/java/com/chaozhanggui/system/cashierservice/constant/TableConstant.java b/src/main/java/com/chaozhanggui/system/cashierservice/constant/TableConstant.java
new file mode 100644
index 0000000..4a422df
--- /dev/null
+++ b/src/main/java/com/chaozhanggui/system/cashierservice/constant/TableConstant.java
@@ -0,0 +1,6 @@
+package com.chaozhanggui.system.cashierservice.constant;
+
+public interface TableConstant {
+
+    String CART_SEAT_ID = "-999";
+}