diff --git a/public/locales/en.json b/public/locales/en.json
index fa4521e..da3855e 100644
--- a/public/locales/en.json
+++ b/public/locales/en.json
@@ -98,6 +98,7 @@
   "node.id": "Node id",
   "node.inputVariable": "Input variables",
   "node.invalidValue": "Invalid value",
+  "node.invalidVariableName": "Invalid variable name, should start with a letter or underscore",
   "node.name": "Node name",
   "node.noNodeSelected": "No node selected",
   "node.oneof.error": "Only one is allowed between input '{{input}}' and argument '{{arg}}({{desc}})'",
diff --git a/public/locales/zh.json b/public/locales/zh.json
index b6c0753..cedcea8 100644
--- a/public/locales/zh.json
+++ b/public/locales/zh.json
@@ -98,6 +98,7 @@
   "node.id": "节点标识",
   "node.inputVariable": "输入变量",
   "node.invalidValue": "无效的值",
+  "node.invalidVariableName": "变量名必须以字母或下划线开头",
   "node.name": "节点名称",
   "node.noNodeSelected": "未选择任务节点",
   "node.oneof.error": "输入项 “{{input}}” 和参数 “{{arg}}({{desc}})” 之中，只能选择设置其中之一",
diff --git a/src/components/inspector.tsx b/src/components/inspector.tsx
index 2d61a07..552476c 100644
--- a/src/components/inspector.tsx
+++ b/src/components/inspector.tsx
@@ -16,6 +16,7 @@ import {
   getNodeArgRawType,
   isNodeArgArray,
   isNodeArgOptional,
+  isValidVariableName,
 } from "@/misc/b3util";
 import { Hotkey, isMacos } from "@/misc/keys";
 import { mergeClassNames } from "@/misc/util";
@@ -436,6 +437,18 @@ const NodeInspector: FC = () => {
                                   name={field.name}
                                   validateTrigger={["onChange", "onBlur"]}
                                   style={{ width: "100%", marginBottom: 5 }}
+                                  rules={[
+                                    {
+                                      validator(_, value) {
+                                        if (value && !isValidVariableName(value)) {
+                                          return Promise.reject(
+                                            new Error(t("node.invalidVariableName"))
+                                          );
+                                        }
+                                        return Promise.resolve();
+                                      },
+                                    },
+                                  ]}
                                 >
                                   <AutoComplete
                                     disabled={disabled}
@@ -489,6 +502,9 @@ const NodeInspector: FC = () => {
                         { required, message: t("node.fileRequired", { field: desc }) },
                         ({ getFieldValue, setFieldValue, isFieldValidating, validateFields }) => ({
                           validator(_, value) {
+                            if (value && !isValidVariableName(value)) {
+                              return Promise.reject(new Error(t("node.invalidVariableName")));
+                            }
                             const arg = def.args?.find(
                               (a) => a.oneof && v.replace("?", "") === a.oneof
                             );
@@ -792,6 +808,18 @@ const NodeInspector: FC = () => {
                                   name={field.name}
                                   validateTrigger={["onChange", "onBlur"]}
                                   style={{ width: "100%", marginBottom: 5 }}
+                                  rules={[
+                                    {
+                                      validator(_, value) {
+                                        if (value && !isValidVariableName(value)) {
+                                          return Promise.reject(
+                                            new Error(t("node.invalidVariableName"))
+                                          );
+                                        }
+                                        return Promise.resolve();
+                                      },
+                                    },
+                                  ]}
                                 >
                                   <AutoComplete
                                     disabled={disabled}
@@ -841,7 +869,17 @@ const NodeInspector: FC = () => {
                       label={desc}
                       name={`output.${i}`}
                       key={`output.${i}`}
-                      rules={[{ required, message: t("node.fileRequired", { field: desc }) }]}
+                      rules={[
+                        { required, message: t("node.fileRequired", { field: desc }) },
+                        {
+                          validator(_, value) {
+                            if (value && !isValidVariableName(value)) {
+                              return Promise.reject(new Error(t("node.invalidVariableName")));
+                            }
+                            return Promise.resolve();
+                          },
+                        },
+                      ]}
                     >
                       <AutoComplete
                         disabled={disabled}
diff --git a/src/misc/b3util.ts b/src/misc/b3util.ts
index e31842f..f20334c 100644
--- a/src/misc/b3util.ts
+++ b/src/misc/b3util.ts
@@ -19,6 +19,10 @@ import { message } from "./hooks";
 import Path from "./path";
 import { zhNodeDef } from "./template";
 
+export const isValidVariableName = (name: string) => {
+  return /^[a-zA-Z_]/.test(name);
+};
+
 export const isSubtreeRoot = (data: TreeGraphData) => {
   return data.path && data.id.toString() !== "1";
 };
@@ -229,6 +233,14 @@ export const checkNodeData = (data: NodeModel | null | undefined) => {
       if (!data.input[i]) {
         data.input[i] = "";
       }
+      if (data.input[i] && !isValidVariableName(data.input[i])) {
+        error(
+          data,
+          `input field '${data.input[i]}' is not a valid variable name,` +
+            `should start with a letter or underscore`
+        );
+        hasError = true;
+      }
       if (!isValidInputOrOutput(conf.input, data.input, i)) {
         error(data, `intput field '${conf.input[i]}' is required`);
         hasError = true;
@@ -251,6 +263,14 @@ export const checkNodeData = (data: NodeModel | null | undefined) => {
       if (!data.output[i]) {
         data.output[i] = "";
       }
+      if (data.output[i] && !isValidVariableName(data.output[i])) {
+        error(
+          data,
+          `output field '${data.output[i]}' is not a valid variable name,` +
+            `should start with a letter or underscore`
+        );
+        hasError = true;
+      }
       if (!isValidInputOrOutput(conf.output, data.output, i)) {
         error(data, `output field '${conf.output[i]}' is required`);
         hasError = true;