diff --git a/tests/account_facts_validation.mjs b/tests/account_facts_validation.mjs
index bfe1870c..ff33cce9 100644
--- a/tests/account_facts_validation.mjs
+++ b/tests/account_facts_validation.mjs
@@ -606,6 +606,7 @@ const driftedTarget = identityDriftRead.accounts.find((item) => item.account_key
 assert.equal(driftedTarget.data_status, "unavailable");
 assert.equal(driftedTarget.identity_mismatch, true);
 assert.equal(driftedTarget.identity_status, "missing_identity");
+assert.equal(driftedTarget.binding_reason, "identity_mismatch");
 assert.equal(driftedTarget.balances.length, 0);
 
 await saveAccounts([account, otherAccount]);
@@ -741,6 +742,7 @@ await saveAccounts([{
 }, otherAccount]);
 const remappedHistory = await (await getHistory("longbridge", "lb-paper", "USD", sessionHeaders, env)).json();
 assert.equal(remappedHistory.identity_mismatch, true);
+assert.equal(remappedHistory.binding_reason, "identity_mismatch");
 assert.equal(remappedHistory.series.points.length, 0);
 
 await saveAccounts([account, otherAccount]);
diff --git a/tests/longbridge_financing_validation.mjs b/tests/longbridge_financing_validation.mjs
index 62d9c0cd..250b8659 100644
--- a/tests/longbridge_financing_validation.mjs
+++ b/tests/longbridge_financing_validation.mjs
@@ -297,6 +297,7 @@ const unboundModel = buildAccountFactsReadModel({
   storedByAccount: new Map([[`longbridge:${option.key}`, withFinancing]]),
 });
 assert.equal(unboundModel.accounts[0].binding_status, "missing");
+assert.equal(unboundModel.accounts[0].binding_reason, "unbound");
 assert.equal(Object.hasOwn(unboundModel.accounts[0], "financing"), false);
 assert.deepEqual(unboundModel.accounts[0].cash, []);
 
@@ -310,6 +311,7 @@ const mismatchModel = buildAccountFactsReadModel({
   storedByAccount: new Map([[`longbridge:${option.key}`, withFinancing]]),
 });
 assert.equal(mismatchModel.accounts[0].identity_mismatch, true);
+assert.equal(mismatchModel.accounts[0].binding_reason, "identity_mismatch");
 assert.equal(Object.hasOwn(mismatchModel.accounts[0], "financing"), false);
 
 const accountFresh = {
diff --git a/web/strategy-switch-console/account_facts.js b/web/strategy-switch-console/account_facts.js
index 613dda3c..290f223b 100644
--- a/web/strategy-switch-console/account_facts.js
+++ b/web/strategy-switch-console/account_facts.js
@@ -924,9 +924,17 @@ export function buildAccountFactsReadModel({
       const binding = bindingByAccount.get(accountId) || null;
       const sourceKey = binding ? `${binding.target_id}|${binding.source_binding.id}` : null;
       let bindingStatus = "missing";
-      if (binding && sourceKey && (sourceCounts.get(sourceKey) || 0) > 1) bindingStatus = "duplicate";
-      else if (binding && accountFactsOptionMatchesBinding(option, binding)) bindingStatus = "bound";
-      else if (binding) bindingStatus = "identity_mismatch";
+      let bindingReason = "unbound";
+      if (binding && sourceKey && (sourceCounts.get(sourceKey) || 0) > 1) {
+        bindingStatus = "duplicate";
+        bindingReason = "duplicate_source";
+      } else if (binding && accountFactsOptionMatchesBinding(option, binding)) {
+        bindingStatus = "bound";
+        bindingReason = "bound";
+      } else if (binding) {
+        bindingStatus = "identity_mismatch";
+        bindingReason = "identity_mismatch";
+      }
 
       const stored = storedByAccount.get(accountId) || null;
       let projected = null;
@@ -965,6 +973,7 @@ export function buildAccountFactsReadModel({
         platform,
         account_key: option.key,
         binding_status: bindingStatus === "identity_mismatch" ? "missing" : bindingStatus,
+        binding_reason: bindingReason,
         identity_status: bindingStatus === "bound" ? "partial_identity" : "missing_identity",
         ...(projected && platform === ACCOUNT_FACTS_PLATFORM && binding?.physical_account_id
           ? { identity_source: "protected_configuration" } : {}),
@@ -1263,6 +1272,7 @@ export function buildAccountFactsHistoryReadModel({
       platform: platform || null,
       account_key: accountKey || null,
       binding_status: "missing",
+      binding_reason: "unbound",
       identity_status: "missing_identity",
       identity_mismatch: false,
       series: projectAccountFactsHistorySeries({ days: [], binding: null, currency }),
@@ -1270,10 +1280,13 @@ export function buildAccountFactsHistoryReadModel({
     };
   }
   let bindingStatus = "missing";
+  let bindingReason = "unbound";
   if (binding && accountFactsOptionMatchesBinding(option, binding) && binding.account_key === accountKey) {
     bindingStatus = "bound";
+    bindingReason = "bound";
   } else if (binding) {
     bindingStatus = "identity_mismatch";
+    bindingReason = "identity_mismatch";
   }
   const qualified = includeCurrencies && bindingStatus === "bound" && typeof currency === "string" && CURRENCY_RE.test(currency)
     ? qualifiedHistoryDays(days, binding) : null;
@@ -1287,6 +1300,7 @@ export function buildAccountFactsHistoryReadModel({
     platform,
     account_key: accountKey,
     binding_status: bindingStatus === "identity_mismatch" ? "missing" : bindingStatus,
+    binding_reason: bindingReason,
     identity_status: bindingStatus === "bound" ? "partial_identity" : "missing_identity",
     identity_mismatch: bindingStatus === "identity_mismatch",
     target_id: bindingStatus === "bound" ? binding.target_id : null,
diff --git a/web/strategy-switch-console/frontend/src/api/contracts.ts b/web/strategy-switch-console/frontend/src/api/contracts.ts
index e9b4f7c8..b70bc2a6 100644
--- a/web/strategy-switch-console/frontend/src/api/contracts.ts
+++ b/web/strategy-switch-console/frontend/src/api/contracts.ts
@@ -774,6 +774,7 @@ export interface AccountFactsAccount {
   platform: string;
   account_key: string;
   binding_status: "bound" | "missing" | "duplicate";
+  binding_reason?: "bound" | "unbound" | "duplicate_source" | "identity_mismatch";
   identity_status: "partial_identity" | "missing_identity";
   identity_source?: "protected_configuration";
   identity_mismatch: boolean;
diff --git a/web/strategy-switch-console/frontend/src/types.ts b/web/strategy-switch-console/frontend/src/types.ts
index 4ae0c823..1f9568f3 100644
--- a/web/strategy-switch-console/frontend/src/types.ts
+++ b/web/strategy-switch-console/frontend/src/types.ts
@@ -82,6 +82,7 @@ export type AccountFactsAccount = {
   platform: string;
   account_key: string;
   binding_status: "bound" | "missing" | "duplicate";
+  binding_reason?: "bound" | "unbound" | "duplicate_source" | "identity_mismatch";
   identity_status: "partial_identity" | "missing_identity";
   identity_mismatch?: boolean;
   aggregation_status?: "included" | "duplicate" | "conflict" | "unverified";
@@ -193,6 +194,7 @@ export type AccountFactsHistorySnapshot = {
   platform: string;
   account_key: string;
   binding_status: "bound" | "missing" | "duplicate";
+  binding_reason?: "bound" | "unbound" | "duplicate_source" | "identity_mismatch";
   identity_status: "partial_identity" | "missing_identity";
   identity_mismatch?: boolean;
   aggregation_status?: "included" | "duplicate" | "conflict" | "unverified";
@@ -380,8 +382,8 @@ export function accountFactsDisplayReady(account: AccountFactsAccount | null | u
 
 export function accountFactsDetail(account: AccountFactsAccount | null | undefined): string {
   if (!account) return "尚未取得账户资产资料";
-  if (account.identity_mismatch === true) return "账户身份不匹配";
-  if (account.binding_status === "duplicate") return "账户资料绑定重复";
+  if (account.binding_reason === "identity_mismatch" || account.identity_mismatch === true) return "账户身份不匹配";
+  if (account.binding_reason === "duplicate_source" || account.binding_status === "duplicate") return "账户资料绑定重复";
   if (account.binding_status === "missing") return "账户资料尚未绑定";
   if (account.identity_status !== "partial_identity") return "账户身份待核实";
   if (account.data_status === "stale") return "账户资产资料已过期";