diff --git a/src/frontend/platform/src/pages/BuildPage/flow/FlowNode/component/VarInput.test.tsx b/src/frontend/platform/src/pages/BuildPage/flow/FlowNode/component/VarInput.test.tsx
new file mode 100644
index 0000000000..e1a8137d1b
--- /dev/null
+++ b/src/frontend/platform/src/pages/BuildPage/flow/FlowNode/component/VarInput.test.tsx
@@ -0,0 +1,57 @@
+import { fireEvent, render } from "@/test/test-utils";
+import type { ReactNode } from "react";
+import { describe, expect, it, vi } from "vitest";
+
+import VarInput from "./VarInput";
+
+vi.mock("../../flowStore", () => ({
+    default: () => ({ flow: { nodes: [] } }),
+}));
+
+vi.mock("../flowNodeStore", () => ({
+    useUpdateVariableState: () => [null],
+}));
+
+vi.mock("./SelectVar", async () => {
+    const { forwardRef } = await import("react");
+    return {
+        default: forwardRef<unknown, { children: ReactNode }>(({ children }, _ref) => children),
+    };
+});
+
+vi.mock("@/components/bs-ui/tooltip/tip", () => ({
+    default: ({ children }) => children,
+}));
+
+vi.mock("@/components/bs-icons/rbDrag", () => ({
+    RbDragIcon: () => null,
+}));
+
+describe("VarInput", () => {
+    it("normalizes non-breaking spaces when serializing variable input", () => {
+        const onChange = vi.fn();
+        const { container } = render(
+            <VarInput
+                nodeId="mcp-node"
+                itemKey="query"
+                paramItem={{
+                    label: "SQL",
+                    required: false,
+                    varZh: { "code.result": "code/result" },
+                }}
+                value=""
+                onChange={onChange}
+            />,
+        );
+        const input = container.querySelector('[contenteditable="true"]');
+        expect(input).not.toBeNull();
+
+        input!.innerHTML =
+            'select * from risk_info where name = <span class="textarea-badge" contenteditable="false">code/result</span>&nbsp;limit 2000';
+        fireEvent.input(input!);
+
+        expect(onChange).toHaveBeenLastCalledWith(
+            "select * from risk_info where name = {{#code.result#}} limit 2000",
+        );
+    });
+});
diff --git a/src/frontend/platform/src/pages/BuildPage/flow/FlowNode/component/VarInput.tsx b/src/frontend/platform/src/pages/BuildPage/flow/FlowNode/component/VarInput.tsx
index d7a6f41d91..877ab94e6d 100644
--- a/src/frontend/platform/src/pages/BuildPage/flow/FlowNode/component/VarInput.tsx
+++ b/src/frontend/platform/src/pages/BuildPage/flow/FlowNode/component/VarInput.tsx
@@ -43,7 +43,7 @@ function parseToValue(input, paramItem) {
             if (child.nodeName === 'BR') {
                 result += '\n'; // 换行符
             } else if (child.nodeType === Node.TEXT_NODE) {
-                result += child.textContent; // 文本内容
+                result += child.textContent.replace(/\u00a0/g, ' '); // 文本内容
             } else if (child.nodeType === Node.ELEMENT_NODE) {
                 result += traverseNodes(child); // 递归解析子元素
             }