diff --git a/apps/server/src/egress.ts b/apps/server/src/egress.ts
index 0318a063..244a744f 100644
--- a/apps/server/src/egress.ts
+++ b/apps/server/src/egress.ts
@@ -72,14 +72,19 @@ export function fetchVia(client: Deno.HttpClient): typeof globalThis.fetch {
     globalThis.fetch(input, { ...init, client } as RequestInit)) as typeof globalThis.fetch;
 }
 
-/** 站点请求的出口:开代理且有代理地址 → proxy,否则 direct */
+/** 站点请求的出口:开代理 → 设置里的站点代理地址,没填则用进程的 HTTPS_PROXY / HTTP_PROXY;都没有 → direct */
 export interface SiteEgress {
   mode: "direct" | "proxy";
   proxyUrl: string | null;
 }
 
-export function siteEgress(proxy: boolean, proxyUrl: string | null | undefined): SiteEgress {
-  return proxy && proxyUrl ? { mode: "proxy", proxyUrl } : { mode: "direct", proxyUrl: null };
+export function siteEgress(
+  proxy: boolean,
+  proxyUrl: string | null | undefined,
+  env: Record<string, string | undefined> = ENV_SNAPSHOT,
+): SiteEgress {
+  const url = proxy ? proxyUrl || env.HTTPS_PROXY || env.https_proxy || env.HTTP_PROXY || env.http_proxy : null;
+  return url ? { mode: "proxy", proxyUrl: url } : { mode: "direct", proxyUrl: null };
 }
 
 /** 出口的比较键(不含代理口令):direct / proxy:<主机:端口> */
diff --git a/apps/server/src/modules/sources-identity/routes/sources.ts b/apps/server/src/modules/sources-identity/routes/sources.ts
index a4e387dc..3c16c7b2 100644
--- a/apps/server/src/modules/sources-identity/routes/sources.ts
+++ b/apps/server/src/modules/sources-identity/routes/sources.ts
@@ -184,7 +184,8 @@ export function sourcesRoutes(app: ModuleApp, rt: () => SourcesRuntime) {
               snapshot_enabled:
                 kind === "pt" ? (body.snapshotEnabled ?? false) : publicDef ? (body.snapshotEnabled ?? true) : false,
               snapshot_interval_sec: body.snapshotIntervalSec ?? null,
-              proxy: body.proxy ?? false,
+              // 内置公开 BT 站(Nyaa 等)国内多数直连不通:默认走代理
+              proxy: body.proxy ?? !!publicDef,
               // 不能搜索的站点不进默认搜索集合
               search_default:
                 kind === "pt" ? (body.searchDefault ?? true) : publicDef ? (body.searchDefault ?? false) : false,
diff --git a/apps/server/test/sources-identity/egress.test.ts b/apps/server/test/sources-identity/egress.test.ts
index dc8222cf..411623a7 100644
--- a/apps/server/test/sources-identity/egress.test.ts
+++ b/apps/server/test/sources-identity/egress.test.ts
@@ -128,6 +128,11 @@ describe("外网请求按环境变量(行为不变,改为显式)", () => {
   it("出口键不含代理口令", () => {
     expect(egressKey(siteEgress(false, "http://u:p@relay:7891"))).toBe("direct");
     expect(egressKey(siteEgress(true, "http://u:p@relay:7891"))).toBe("proxy:http://relay:7891");
-    expect(egressKey(siteEgress(true, null))).toBe("direct");
+    expect(egressKey(siteEgress(true, null, {}))).toBe("direct");
+    // 设置里没填站点代理地址:沿用进程的 HTTPS_PROXY
+    expect(egressKey(siteEgress(true, null, { HTTPS_PROXY: "http://172.17.0.1:7891" }))).toBe(
+      "proxy:http://172.17.0.1:7891",
+    );
+    expect(egressKey(siteEgress(false, null, { HTTPS_PROXY: "http://172.17.0.1:7891" }))).toBe("direct");
   });
 });
diff --git a/apps/server/test/sources-identity/site-kinds.test.ts b/apps/server/test/sources-identity/site-kinds.test.ts
index deed504a..848240da 100644
--- a/apps/server/test/sources-identity/site-kinds.test.ts
+++ b/apps/server/test/sources-identity/site-kinds.test.ts
@@ -138,6 +138,7 @@ describe.skipIf(!up)("站点类型:API、调度与 RSS", () => {
       kind: "public_bt",
       adapter: "api",
       snapshotEnabled: true,
+      proxy: true,
       searchDefault: false,
     });
     expect(nyaa.body.data.capabilities).toEqual(expect.arrayContaining(["search", "list"]));