diff --git a/packages/core/src/node-identity.test.ts b/packages/core/src/node-identity.test.ts
new file mode 100644
index 0000000..3100164
--- /dev/null
+++ b/packages/core/src/node-identity.test.ts
@@ -0,0 +1,66 @@
+import { describe, expect, it } from "vitest";
+import type { ParsedNode } from "./types/node";
+import { buildNodeContentKey, stableJsonStringify } from "./node-identity";
+
+// 测试数据全部为虚构，不包含任何真实订阅信息
+function realityNode(name: string, uuid: string, spiderX: string, patch: Record<string, unknown> = {}): ParsedNode {
+  return {
+    name,
+    type: "vless",
+    server: "reality.example.com",
+    port: 443,
+    uuid,
+    tls: true,
+    "client-fingerprint": "chrome",
+    flow: "xtls-rprx-vision",
+    network: "tcp",
+    "reality-opts": {
+      "public-key": "FAKE_PUBLIC_KEY_AAAAAAAAAAAAAAAA",
+      "short-id": "0000",
+      "_spider-x": spiderX,
+    },
+    ...patch,
+  } as unknown as ParsedNode;
+}
+
+const UUID_A = "11111111-1111-1111-1111-111111111111";
+const UUID_B = "22222222-2222-2222-2222-222222222222";
+
+describe("stableJsonStringify", () => {
+  it("preserves nested underscore-prefixed keys for generic serialization", () => {
+    const first = stableJsonStringify({ nested: { _nonce: "a", value: 1 } });
+    const second = stableJsonStringify({ nested: { _nonce: "b", value: 1 } });
+
+    expect(first).toBe('{"nested":{"_nonce":"a","value":1}}');
+    expect(second).not.toBe(first);
+  });
+});
+
+describe("buildNodeContentKey", () => {
+  it("ignores nested internal underscore fields such as reality-opts._spider-x", () => {
+    const stored = realityNode("Reality Node A (v1)", UUID_A, "/spider-old");
+    const fresh = realityNode("Reality Node A (v2)", UUID_A, "/spider-new");
+
+    // spider-x 轮换 + 显示名动态变化，不应改变内容指纹
+    expect(buildNodeContentKey(fresh)).toBe(buildNodeContentKey(stored));
+  });
+
+  it("still distinguishes nodes whose real identity fields differ", () => {
+    const nodeA = realityNode("Node A", UUID_A, "/spider-a");
+    const nodeB = realityNode("Node B", UUID_B, "/spider-a");
+
+    expect(buildNodeContentKey(nodeB)).not.toBe(buildNodeContentKey(nodeA));
+  });
+
+  it("keeps ignoring top-level internal fields (existing behavior)", () => {
+    const base = realityNode("Same Node", UUID_A, "/spider");
+    const withMeta = {
+      ...base,
+      _sourceIds: ["source-a"],
+      _originName: "origin-a",
+      _meta: { importedAt: 1 },
+    };
+
+    expect(buildNodeContentKey(withMeta)).toBe(buildNodeContentKey(base));
+  });
+});
diff --git a/packages/core/src/node-identity.ts b/packages/core/src/node-identity.ts
index a1ac8dd..a0b9ff6 100644
--- a/packages/core/src/node-identity.ts
+++ b/packages/core/src/node-identity.ts
@@ -7,7 +7,10 @@ export interface NodeContentKeyOptions {
   ignoreServername?: boolean;
 }
 
-export function stableJsonStringify(value: unknown): string {
+function stableJsonStringifyWithKeyFilter(
+  value: unknown,
+  includeKey: (key: string) => boolean
+): string {
   const seen = new WeakSet<object>();
 
   const normalize = (input: unknown): unknown => {
@@ -20,13 +23,20 @@ export function stableJsonStringify(value: unknown): string {
     const obj = input as Record<string, unknown>;
     const keys = Object.keys(obj).sort();
     const out: Record<string, unknown> = {};
-    for (const key of keys) out[key] = normalize(obj[key]);
+    for (const key of keys) {
+      if (!includeKey(key)) continue;
+      out[key] = normalize(obj[key]);
+    }
     return out;
   };
 
   return JSON.stringify(normalize(value));
 }
 
+export function stableJsonStringify(value: unknown): string {
+  return stableJsonStringifyWithKeyFilter(value, () => true);
+}
+
 export function buildNodeContentKey(
   node: ParsedNode,
   opts?: NodeContentKeyOptions
@@ -43,7 +53,9 @@ export function buildNodeContentKey(
     })
   );
 
-  return stableJsonStringify(filtered);
+  // 节点内部字段不属于内容身份；例如机场轮换 reality-opts._spider-x
+  // 时，节点的稳定身份不应随之变化。
+  return stableJsonStringifyWithKeyFilter(filtered, (key) => !key.startsWith("_"));
 }
 
 export function buildScopedNodeIdentityKey(scope: string, node: ParsedNode): string {
diff --git a/packages/core/src/subscription/source-node-refresh-reality.test.ts b/packages/core/src/subscription/source-node-refresh-reality.test.ts
new file mode 100644
index 0000000..3ab5887
--- /dev/null
+++ b/packages/core/src/subscription/source-node-refresh-reality.test.ts
@@ -0,0 +1,87 @@
+import { describe, expect, it } from "vitest";
+import type { ParsedNode } from "../types/node";
+import { ORIGIN_NAME_KEY, SOURCE_IDS_KEY } from "./node-source-state";
+import { mergeParsedSourceNodes, prepareSourceParsedNodes } from "./source-node-refresh";
+
+const REALITY_UUID = "11111111-1111-1111-1111-111111111111";
+
+function realityNode(name: string, spiderX: string, patch: Record<string, unknown> = {}): ParsedNode {
+  return {
+    name,
+    type: "vless",
+    server: "reality.example.com",
+    port: 443,
+    uuid: REALITY_UUID,
+    tls: true,
+    "client-fingerprint": "chrome",
+    flow: "xtls-rprx-vision",
+    network: "tcp",
+    udp: true,
+    "reality-opts": {
+      "public-key": "FAKE_PUBLIC_KEY_AAAAAAAAAAAAAAAA",
+      "short-id": "0000",
+      "_spider-x": spiderX,
+    },
+    ...patch,
+  } as ParsedNode;
+}
+
+function ssNode(name: string): ParsedNode {
+  return {
+    name,
+    type: "ss",
+    server: `${name.toLowerCase()}.example.com`,
+    port: 8388,
+    cipher: "aes-128-gcm",
+    password: "secret",
+  } as ParsedNode;
+}
+
+describe("source node refresh reality identity", () => {
+  it("keeps matching a reality node when spider-x rotates and updates its automatic name", () => {
+    const state = [
+      ssNode("before"),
+      realityNode("Reality Node A (v1)", "/spider-old", {
+        [ORIGIN_NAME_KEY]: "Reality Node A (v1)",
+        [SOURCE_IDS_KEY]: ["source-a"],
+      }),
+      ssNode("after"),
+    ];
+    const parsed = prepareSourceParsedNodes([realityNode("Reality Node A (v2)", "/spider-new")], {});
+
+    const result = mergeParsedSourceNodes(state, parsed, [], { sourceId: "source-a" });
+
+    expect(result.nodes.map((node) => node.name)).toEqual(["before", "Reality Node A (v2)", "after"]);
+    expect(result.nodes[1]).toMatchObject({
+      uuid: REALITY_UUID,
+      [ORIGIN_NAME_KEY]: "Reality Node A (v2)",
+      [SOURCE_IDS_KEY]: ["source-a"],
+    });
+    expect(
+      (result.nodes[1] as unknown as { "reality-opts"?: { "_spider-x"?: string } })["reality-opts"]?.["_spider-x"]
+    ).toBe("/spider-new");
+  });
+
+  it("preserves a manual name while refreshing the origin and spider-x", () => {
+    const state = [
+      realityNode("Pinned Reality Name", "/spider-old", {
+        [ORIGIN_NAME_KEY]: "Reality Node A (v1)",
+        [SOURCE_IDS_KEY]: ["source-a"],
+      }),
+    ];
+    const parsed = prepareSourceParsedNodes([realityNode("Reality Node A (v2)", "/spider-new")], {});
+
+    const result = mergeParsedSourceNodes(state, parsed, [], { sourceId: "source-a" });
+
+    expect(result.nodes).toHaveLength(1);
+    expect(result.nodes[0]).toMatchObject({
+      name: "Pinned Reality Name",
+      uuid: REALITY_UUID,
+      [ORIGIN_NAME_KEY]: "Reality Node A (v2)",
+      [SOURCE_IDS_KEY]: ["source-a"],
+    });
+    expect(
+      (result.nodes[0] as unknown as { "reality-opts"?: { "_spider-x"?: string } })["reality-opts"]?.["_spider-x"]
+    ).toBe("/spider-new");
+  });
+});
diff --git a/packages/core/src/subscription/source-node-refresh.test.ts b/packages/core/src/subscription/source-node-refresh.test.ts
index e4ed0e1..165cca8 100644
--- a/packages/core/src/subscription/source-node-refresh.test.ts
+++ b/packages/core/src/subscription/source-node-refresh.test.ts
@@ -554,6 +554,7 @@ describe("source node refresh helpers", () => {
       [SOURCE_IDS_KEY]: ["source-b", "source-a"],
     });
   });
+
 });
 
 describe("subscription response info helpers", () => {
diff --git a/packages/core/src/subscription/source-node-refresh.ts b/packages/core/src/subscription/source-node-refresh.ts
index a977053..f73ee18 100644
--- a/packages/core/src/subscription/source-node-refresh.ts
+++ b/packages/core/src/subscription/source-node-refresh.ts
@@ -332,7 +332,8 @@ export function mergeParsedSourceNodes(
 
     if (sourceIds.includes(sourceId)) {
       hadExistingSourceNodes = true;
-      const originName = resolveOriginName(node, { allowDisplayNameFallback }) ?? originOf(node);
+      const previousOriginName = originOf(node);
+      const originName = resolveOriginName(node, { allowDisplayNameFallback }) ?? previousOriginName;
       const fresh = originName ? takeFresh(originName) : null;
 
       const base = withoutNodeSourceIds(node, removed);
@@ -341,7 +342,7 @@ export function mergeParsedSourceNodes(
         continue;
       }
 
-      const keepUserName = originName ? isUserRenamed(node.name, originName) : false;
+      const keepUserName = previousOriginName ? isUserRenamed(node.name, previousOriginName) : false;
       const desiredName = keepUserName ? node.name : fresh.name;
       const extraIds = base ? getNodeSourceIds(base) : sourceIds.filter((id) => id !== sourceId);