diff --git a/frontend/src/app/api/synastry-reports/route.ts b/frontend/src/app/api/synastry-reports/route.ts
new file mode 100644
index 00000000..e51a2b81
--- /dev/null
+++ b/frontend/src/app/api/synastry-reports/route.ts
@@ -0,0 +1,72 @@
+import { NextResponse } from "next/server";
+import { isSupabaseConfigurationError } from "@/lib/supabase/config";
+import { createServerSupabaseClient } from "@/lib/supabase/server";
+
+type SynastryReportPayload = {
+  id?: string;
+  partnerName?: string;
+  report?: unknown;
+};
+
+function errorMessage(error: unknown, fallback: string) {
+  return error instanceof Error ? error.message : fallback;
+}
+
+export async function GET() {
+  try {
+    const supabase = await createServerSupabaseClient();
+    const { data: { user } } = await supabase.auth.getUser();
+    if (!user) return NextResponse.json({ error: "请先登录" }, { status: 401 });
+
+    const { data, error } = await supabase
+      .from("synastry_reports")
+      .select("id, partner_name, report, created_at")
+      .eq("user_id", user.id)
+      .order("created_at", { ascending: false })
+      .limit(10);
+
+    if (error) throw error;
+    return NextResponse.json({ reports: data ?? [] });
+  } catch (error) {
+    if (isSupabaseConfigurationError(error)) {
+      return NextResponse.json({ error: "Supabase 尚未配置", code: "SUPABASE_NOT_CONFIGURED" }, { status: 503 });
+    }
+    return NextResponse.json({ error: errorMessage(error, "合盘历史暂时不可用") }, { status: 500 });
+  }
+}
+
+export async function POST(request: Request) {
+  try {
+    const body = await request.json().catch(() => null) as SynastryReportPayload | null;
+    if (!body?.report || typeof body.report !== "object" || Array.isArray(body.report)) {
+      return NextResponse.json({ error: "合盘报告格式不正确" }, { status: 400 });
+    }
+
+    const supabase = await createServerSupabaseClient();
+    const { data: { user } } = await supabase.auth.getUser();
+    if (!user) return NextResponse.json({ error: "请先登录" }, { status: 401 });
+
+    const partnerName = body.partnerName?.trim() || "对方";
+    const record = {
+      ...(body.id ? { id: body.id } : {}),
+      user_id: user.id,
+      partner_name: partnerName,
+      report: body.report,
+      created_at: new Date().toISOString(),
+    };
+
+    const { data, error } = await supabase
+      .from("synastry_reports")
+      .insert(record)
+      .select("id, partner_name, report, created_at")
+      .single();
+
+    if (error) throw error;
+    return NextResponse.json({ report: data });
+  } catch (error) {
+    if (isSupabaseConfigurationError(error)) {
+      return NextResponse.json({ error: "Supabase 尚未配置", code: "SUPABASE_NOT_CONFIGURED" }, { status: 503 });
+    }
+    return NextResponse.json({ error: errorMessage(error, "合盘历史保存失败") }, { status: 500 });
+  }
+}
diff --git a/frontend/src/app/page.tsx b/frontend/src/app/page.tsx
index ed7c546c..323fb786 100644
--- a/frontend/src/app/page.tsx
+++ b/frontend/src/app/page.tsx
@@ -58,6 +58,12 @@ type SynastryReportCard = {
   nextEvidence?: string[];
   createdAt: number;
 };
+type SynastryReportApiRecord = {
+  id: string;
+  partner_name?: string;
+  report?: SynastryReportCard;
+  created_at?: string;
+};
 type ChatSession = { id: string; title: string; theme: Theme; modelId: string; messages: Message[]; updatedAt: number };
 type RequestError = { sessionId: string; message: string };
 type StreamingReply = { sessionId: string; text: string };
@@ -229,6 +235,38 @@ function readSynastryHistory(accountId: string): SynastryReportCard[] {
   }
 }
 
+function writeSynastryHistory(accountId: string, history: SynastryReportCard[]) {
+  localStorage.setItem(synastryHistoryStorageKey(accountId), JSON.stringify(history.slice(0, 10)));
+}
+
+function normalizeSynastryReportApiRecord(record: SynastryReportApiRecord): SynastryReportCard | null {
+  if (!record.report || typeof record.report !== "object") return null;
+  return {
+    ...record.report,
+    id: record.id,
+    partnerName: record.partner_name || record.report.partnerName || "对方",
+    createdAt: Date.parse(record.created_at || "") || record.report.createdAt || timestamp(),
+  };
+}
+
+async function fetchCloudSynastryHistory() {
+  const response = await fetch("/api/synastry-reports", { cache: "no-store" });
+  if (!response.ok) throw new Error("cloud_synastry_history_unavailable");
+  const payload = await response.json().catch(() => null) as { reports?: SynastryReportApiRecord[] } | null;
+  return (payload?.reports || []).map(normalizeSynastryReportApiRecord).filter(Boolean) as SynastryReportCard[];
+}
+
+async function saveCloudSynastryReport(report: SynastryReportCard) {
+  const response = await fetch("/api/synastry-reports", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ partnerName: report.partnerName, report }),
+  });
+  if (!response.ok) throw new Error("cloud_synastry_report_save_failed");
+  const payload = await response.json().catch(() => null) as { report?: SynastryReportApiRecord } | null;
+  return payload?.report ? normalizeSynastryReportApiRecord(payload.report) || report : report;
+}
+
 function normalizeChartLibraryApiRecord(record: ChartLibraryApiRecord): ChartLibraryRecord {
   return {
     id: record.role === "self" ? "self" : record.id,
@@ -636,6 +674,18 @@ export default function Home() {
       .catch(() => {
         // Cloud chart library is best-effort; local library remains usable.
       });
+    void fetchCloudSynastryHistory()
+      .then((cloudHistory) => {
+        setSynastryHistory((current) => {
+          const byId = new Map([...current, ...cloudHistory].map((record) => [record.id, record] as const));
+          const next = [...byId.values()].sort((a, b) => b.createdAt - a.createdAt).slice(0, 10);
+          writeSynastryHistory(accountId, next);
+          return next;
+        });
+      })
+      .catch(() => {
+        // Cloud synastry history is best-effort; local history remains usable.
+      });
   }, [accountId, profile]);
 
   useEffect(() => {
@@ -1303,11 +1353,19 @@ export default function Home() {
           nextEvidence: payload.relationshipReport?.nextEvidence,
           createdAt: Date.now(),
         };
-        setSynastryReportCard(reportCard);
+        let savedReportCard = reportCard;
+        if (accountId) {
+          try {
+            savedReportCard = await saveCloudSynastryReport(reportCard);
+          } catch {
+            // Local history remains the fallback when cloud persistence is unavailable.
+          }
+        }
+        setSynastryReportCard(savedReportCard);
         if (accountId) {
           setSynastryHistory((current) => {
-            const next = [reportCard, ...current].slice(0, 10);
-            localStorage.setItem(synastryHistoryStorageKey(accountId), JSON.stringify(next));
+            const next = [savedReportCard, ...current.filter((item) => item.id !== savedReportCard.id)].slice(0, 10);
+            writeSynastryHistory(accountId, next);
             return next;
           });
         }
diff --git a/frontend/supabase/migrations/20260717020000_synastry_reports.sql b/frontend/supabase/migrations/20260717020000_synastry_reports.sql
new file mode 100644
index 00000000..f9f14d8b
--- /dev/null
+++ b/frontend/supabase/migrations/20260717020000_synastry_reports.sql
@@ -0,0 +1,36 @@
+begin;
+
+create table if not exists public.synastry_reports (
+  id uuid primary key default gen_random_uuid(),
+  user_id uuid not null references auth.users(id) on delete cascade,
+  partner_name text not null default '对方',
+  report jsonb not null check (jsonb_typeof(report) = 'object'),
+  created_at timestamptz not null default now()
+);
+
+create index if not exists synastry_reports_user_created_at_idx
+  on public.synastry_reports (user_id, created_at desc);
+
+alter table public.synastry_reports enable row level security;
+
+drop policy if exists synastry_reports_select_own on public.synastry_reports;
+create policy synastry_reports_select_own
+  on public.synastry_reports for select to authenticated
+  using ((select auth.uid()) = user_id);
+
+drop policy if exists synastry_reports_insert_own on public.synastry_reports;
+create policy synastry_reports_insert_own
+  on public.synastry_reports for insert to authenticated
+  with check ((select auth.uid()) = user_id);
+
+drop policy if exists synastry_reports_delete_own on public.synastry_reports;
+create policy synastry_reports_delete_own
+  on public.synastry_reports for delete to authenticated
+  using ((select auth.uid()) = user_id);
+
+revoke all on table public.synastry_reports from anon, authenticated, service_role;
+grant select on table public.synastry_reports to authenticated;
+grant insert (id, user_id, partner_name, report, created_at) on table public.synastry_reports to authenticated;
+grant delete on table public.synastry_reports to authenticated;
+
+commit;
diff --git a/tests/test_supabase_user_data_contract.py b/tests/test_supabase_user_data_contract.py
index 97c6e842..27d96533 100644
--- a/tests/test_supabase_user_data_contract.py
+++ b/tests/test_supabase_user_data_contract.py
@@ -30,10 +30,18 @@ CHART_PROFILE_MIGRATION = (
     / "migrations"
     / "20260717010000_chart_profiles.sql"
 )
+SYNASTRY_REPORT_MIGRATION = (
+    Path(__file__).resolve().parents[1]
+    / "frontend"
+    / "supabase"
+    / "migrations"
+    / "20260717020000_synastry_reports.sql"
+)
 PAGE = Path(__file__).resolve().parents[1] / "frontend" / "src" / "app" / "page.tsx"
 CHART_PROFILE_ROUTE = Path(__file__).resolve().parents[1] / "frontend" / "src" / "app" / "api" / "chart-profiles" / "route.ts"
 CHART_PROFILE_DELETE_ROUTE = Path(__file__).resolve().parents[1] / "frontend" / "src" / "app" / "api" / "chart-profiles" / "[id]" / "route.ts"
 SYNASTRY_ROUTE = Path(__file__).resolve().parents[1] / "frontend" / "src" / "app" / "api" / "synastry" / "route.ts"
+SYNASTRY_REPORT_ROUTE = Path(__file__).resolve().parents[1] / "frontend" / "src" / "app" / "api" / "synastry-reports" / "route.ts"
 
 
 def _sql() -> str:
@@ -183,6 +191,46 @@ def test_synastry_route_orchestrates_python_chart_and_ashtakoot() -> None:
         assert token in route
 
 
+def test_synastry_reports_are_cloud_persisted_per_user() -> None:
+    sql = re.sub(r"\s+", " ", SYNASTRY_REPORT_MIGRATION.read_text(encoding="utf-8").lower()).strip()
+    route = SYNASTRY_REPORT_ROUTE.read_text(encoding="utf-8")
+    page = PAGE.read_text(encoding="utf-8")
+
+    for token in (
+        "create table if not exists public.synastry_reports",
+        "user_id uuid not null references auth.users(id) on delete cascade",
+        "partner_name text not null default '对方'",
+        "report jsonb not null check (jsonb_typeof(report) = 'object')",
+        "alter table public.synastry_reports enable row level security",
+        "create policy synastry_reports_select_own on public.synastry_reports for select to authenticated using ((select auth.uid()) = user_id)",
+        "create policy synastry_reports_insert_own on public.synastry_reports for insert to authenticated with check ((select auth.uid()) = user_id)",
+        "create policy synastry_reports_delete_own on public.synastry_reports for delete to authenticated using ((select auth.uid()) = user_id)",
+        "grant select on table public.synastry_reports to authenticated",
+        "grant insert (id, user_id, partner_name, report, created_at) on table public.synastry_reports to authenticated",
+    ):
+        assert token in sql
+
+    for token in (
+        '.from("synastry_reports")',
+        '.select("id, partner_name, report, created_at")',
+        ".eq(\"user_id\", user.id)",
+        ".limit(10)",
+        "partner_name: partnerName",
+        "report: body.report",
+    ):
+        assert token in route
+
+    for token in (
+        "fetchCloudSynastryHistory",
+        "saveCloudSynastryReport",
+        'fetch("/api/synastry-reports"',
+        "writeSynastryHistory(accountId, next)",
+        "cloud_synastry_history_unavailable",
+        "cloud_synastry_report_save_failed",
+    ):
+        assert token in page
+
+
 def test_consultation_credit_lifecycle_is_idempotent_and_server_only() -> None:
     sql = re.sub(r"\s+", " ", CONSULTATION_MIGRATION.read_text(encoding="utf-8").lower()).strip()