diff --git a/frontend/src/lib/xray/spider-x.ts b/frontend/src/lib/xray/spider-x.ts
index b70003abc..a920b88c4 100644
--- a/frontend/src/lib/xray/spider-x.ts
+++ b/frontend/src/lib/xray/spider-x.ts
@@ -1,10 +1,12 @@
 import { sha256 } from '@noble/hashes/sha2.js';
 import { bytesToHex, utf8ToBytes } from '@noble/hashes/utils.js';
 
-// Mirrors deriveSpiderX in internal/sub/service.go byte-for-byte so panel
-// links and subscription links agree; returns '' when there is no seed and
-// no client key (the caller then omits spx, as the legacy builder did).
+// Mirrors deriveSpiderX in internal/sub/service.go byte-for-byte, seed query included (#6693);
+// '' with neither seed nor client key, so the caller omits spx as the legacy builder did.
 export function deriveSpiderX(seed: string, clientKey: string): string {
   if (!seed && !clientKey) return '';
-  return `/${bytesToHex(sha256(utf8ToBytes(`${seed}|${clientKey}`))).slice(0, 15)}`;
+  const path = `/${bytesToHex(sha256(utf8ToBytes(`${seed}|${clientKey}`))).slice(0, 15)}`;
+  const at = seed.indexOf('?');
+  const query = at === -1 ? '' : seed.slice(at + 1);
+  return query ? `${path}?${query}` : path;
 }
diff --git a/frontend/src/test/spider-x.test.ts b/frontend/src/test/spider-x.test.ts
index bf405ef06..1155b1dff 100644
--- a/frontend/src/test/spider-x.test.ts
+++ b/frontend/src/test/spider-x.test.ts
@@ -9,6 +9,12 @@ describe('deriveSpiderX', () => {
   it('matches the Go deriveSpiderX vectors', () => {
     expect(deriveSpiderX('/seed', 'subAlice')).toBe('/c252fbc3ecd3e3c');
     expect(deriveSpiderX('/', '')).toBe('/d08ed99bd9afc60');
+    expect(deriveSpiderX('/seed?p=40-400&r=500-2000', 'subAlice')).toBe(
+      '/09dd00b3f8c01f5?p=40-400&r=500-2000',
+    );
+    expect(deriveSpiderX('/?p=40-400&c=1-4&t=1-3&i=1500-6000&r=500-2000', '')).toBe(
+      '/ac2cb268d22908e?p=40-400&c=1-4&t=1-3&i=1500-6000&r=500-2000',
+    );
   });
 
   it('is stable per client, distinct across clients, and rotates with the seed', () => {
diff --git a/internal/sub/service.go b/internal/sub/service.go
index d1f832ee6..a407a50c8 100644
--- a/internal/sub/service.go
+++ b/internal/sub/service.go
@@ -2016,14 +2016,18 @@ func subKey(c model.Client) string {
 	return c.Email
 }
 
-// deriveSpiderX maps the inbound's spiderX seed plus a stable client key to a
-// deterministic per-client "/path"; frontend/src/lib/xray/spider-x.ts mirrors it.
+// deriveSpiderX maps the seed and a stable client key to a per-client "/path" plus the seed's
+// query, where xray reads its spider settings (#6693); frontend/src/lib/xray/spider-x.ts mirrors it.
 func deriveSpiderX(seed, clientKey string) string {
 	if seed == "" && clientKey == "" {
 		return "/" + random.Seq(15)
 	}
 	sum := sha256.Sum256([]byte(seed + "|" + clientKey))
-	return "/" + hex.EncodeToString(sum[:])[:15]
+	path := "/" + hex.EncodeToString(sum[:])[:15]
+	if _, query, _ := strings.Cut(seed, "?"); query != "" {
+		return path + "?" + query
+	}
+	return path
 }
 
 func buildVmessLink(obj map[string]any) string {
diff --git a/internal/sub/service_sharelink_test.go b/internal/sub/service_sharelink_test.go
index 7da4367fb..de2478094 100644
--- a/internal/sub/service_sharelink_test.go
+++ b/internal/sub/service_sharelink_test.go
@@ -143,6 +143,23 @@ func TestGenVlessLink_RealitySpiderXPerClientStable(t *testing.T) {
 	}
 }
 
+// A seed's spider settings (p, c, t, i, r) ride along in the share link's spx,
+// escaped so they stay inside that one parameter.
+func TestGenVlessLink_RealitySpiderXKeepsSpiderSettings(t *testing.T) {
+	s := &SubService{}
+	inbound := realityTwoClientInbound()
+	inbound.StreamSettings = strings.Replace(inbound.StreamSettings, `"spiderX":"/seed"`, `"spiderX":"/seed?p=40-400&r=500-2000"`, 1)
+
+	link := s.genVlessLink(inbound, "alice")
+	if got, want := spxParam(t, link), "/09dd00b3f8c01f5?p=40-400&r=500-2000"; got != want {
+		t.Fatalf("spx = %q, want %q", got, want)
+	}
+	u, _ := url.Parse(link)
+	if u.Query().Get("p") != "" || u.Query().Get("r") != "" {
+		t.Fatalf("spider settings leaked out of spx into the link's own query: %q", link)
+	}
+}
+
 func TestDeriveSpiderX(t *testing.T) {
 	if got := deriveSpiderX("seed", "clientA"); got != deriveSpiderX("seed", "clientA") {
 		t.Fatalf("deriveSpiderX not deterministic: %q", got)
@@ -168,6 +185,10 @@ func TestDeriveSpiderXMatchesFrontendVectors(t *testing.T) {
 	vectors := map[string]struct{ seed, clientKey, want string }{
 		"seed and subId": {"/seed", "subAlice", "/c252fbc3ecd3e3c"},
 		"seed only":      {"/", "", "/d08ed99bd9afc60"},
+		// xray reads p, c, t, i and r from the spiderX query as the spider's
+		// own settings, so the seed's query must survive the derivation.
+		"seed with spider settings": {"/seed?p=40-400&r=500-2000", "subAlice", "/09dd00b3f8c01f5?p=40-400&r=500-2000"},
+		"spider settings only":      {"/?p=40-400&c=1-4&t=1-3&i=1500-6000&r=500-2000", "", "/ac2cb268d22908e?p=40-400&c=1-4&t=1-3&i=1500-6000&r=500-2000"},
 	}
 	for name, v := range vectors {
 		t.Run(name, func(t *testing.T) {