diff --git a/server/app/goauto/sybshop/reconcile.go b/server/app/goauto/sybshop/reconcile.go
new file mode 100644
index 0000000..350e52b
--- /dev/null
+++ b/server/app/goauto/sybshop/reconcile.go
@@ -0,0 +1,91 @@
+package sybshop
+
+import (
+	"context"
+	"fmt"
+
+	"go-admin/app/goauto/models"
+
+	"gorm.io/gorm"
+)
+
+// ReconcileNormalizedNames repairs the matching keys of live SYB shops created
+// before Normalize became the single write-path rule. It changes neither the
+// display name nor the enabled state. The operation is safe to repeat.
+//
+// A normalised-name collision is a data ambiguity. It must be resolved by an
+// operator, rather than silently merging shops or choosing one arbitrarily.
+func ReconcileNormalizedNames(ctx context.Context, db *gorm.DB) (int, error) {
+	if db == nil {
+		return 0, fmt.Errorf("syb shop normalized-name repair: database is nil")
+	}
+
+	updated := 0
+	err := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		var shops []models.SYBShop
+		if err := tx.Order("id ASC").Find(&shops).Error; err != nil {
+			return err
+		}
+
+		desiredOwners := make(map[string]uint64, len(shops))
+		currentKeys := make(map[string]struct{}, len(shops))
+		type repair struct {
+			id      uint64
+			desired string
+			temp    string
+		}
+		repairs := make([]repair, 0)
+		for _, shop := range shops {
+			desired := Normalize(shop.DisplayName)
+			if desired == "" {
+				return fmt.Errorf("syb shop normalized-name repair: shop %d has blank display name", shop.ID)
+			}
+			if owner, exists := desiredOwners[desired]; exists && owner != shop.ID {
+				return fmt.Errorf("syb shop normalized-name repair: normalized key conflict between shops %d and %d", owner, shop.ID)
+			}
+			desiredOwners[desired] = shop.ID
+			currentKeys[shop.NormalizedName] = struct{}{}
+			if shop.NormalizedName != desired {
+				repairs = append(repairs, repair{id: shop.ID, desired: desired})
+			}
+		}
+
+		// Keys can be swapped (for example stale "a"/"b" values). Stage every
+		// repair through a unique temporary key so the unique index is preserved
+		// throughout the transaction.
+		reserved := make(map[string]struct{}, len(currentKeys)+len(desiredOwners))
+		for key := range currentKeys {
+			reserved[key] = struct{}{}
+		}
+		for key := range desiredOwners {
+			reserved[key] = struct{}{}
+		}
+		for index := range repairs {
+			base := fmt.Sprintf("__goauto_syb_shop_normalize_repair_%d__", repairs[index].id)
+			temp := base
+			for suffix := 1; ; suffix++ {
+				if _, exists := reserved[temp]; !exists {
+					break
+				}
+				temp = fmt.Sprintf("%s%d", base, suffix)
+			}
+			repairs[index].temp = temp
+			reserved[temp] = struct{}{}
+		}
+		for _, repair := range repairs {
+			if err := tx.Model(&models.SYBShop{}).Where("id = ?", repair.id).
+				UpdateColumn("normalized_name", repair.temp).Error; err != nil {
+				return err
+			}
+		}
+		for _, repair := range repairs {
+			if err := tx.Model(&models.SYBShop{}).Where("id = ?", repair.id).
+				UpdateColumn("normalized_name", repair.desired).Error; err != nil {
+				return err
+			}
+		}
+		updated = len(repairs)
+		return nil
+	})
+	return updated, err
+}
diff --git a/server/app/goauto/sybshop/reconcile_test.go b/server/app/goauto/sybshop/reconcile_test.go
new file mode 100644
index 0000000..be2eba7
--- /dev/null
+++ b/server/app/goauto/sybshop/reconcile_test.go
@@ -0,0 +1,93 @@
+package sybshop_test
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"go-admin/app/goauto/models"
+	"go-admin/app/goauto/sybshop"
+)
+
+func TestReconcileNormalizedNamesRepairsLegacyKey(t *testing.T) {
+	db := openDB(t)
+	shop := models.SYBShop{DisplayName: "樂齡樂活美學館｜銀髮居家熟齡悅己壯世代優雅生活", NormalizedName: "legacy-key", Enabled: true}
+	if err := db.Create(&shop).Error; err != nil {
+		t.Fatalf("创建历史店铺失败: %v", err)
+	}
+
+	updated, err := sybshop.ReconcileNormalizedNames(context.Background(), db)
+	if err != nil {
+		t.Fatalf("回填失败: %v", err)
+	}
+	if updated != 1 {
+		t.Fatalf("应修复 1 条，实际 %d", updated)
+	}
+	var reloaded models.SYBShop
+	if err := db.First(&reloaded, shop.ID).Error; err != nil {
+		t.Fatalf("读取修复结果失败: %v", err)
+	}
+	if reloaded.NormalizedName != sybshop.Normalize(shop.DisplayName) {
+		t.Fatalf("规范化键不正确: %q", reloaded.NormalizedName)
+	}
+	if reloaded.DisplayName != shop.DisplayName || !reloaded.Enabled {
+		t.Fatalf("回填不应修改展示名或启用状态: %+v", reloaded)
+	}
+	names, err := sybshop.EnabledNames(context.Background(), db)
+	if err != nil || names[sybshop.Normalize(shop.DisplayName)] != shop.DisplayName {
+		t.Fatalf("修复后启用快照未命中: names=%v err=%v", names, err)
+	}
+
+	updated, err = sybshop.ReconcileNormalizedNames(context.Background(), db)
+	if err != nil || updated != 0 {
+		t.Fatalf("重复回填应无变化: updated=%d err=%v", updated, err)
+	}
+}
+
+func TestReconcileNormalizedNamesRejectsCollisionWithoutWriting(t *testing.T) {
+	db := openDB(t)
+	first := models.SYBShop{DisplayName: "Ａ店", NormalizedName: "legacy-one", Enabled: true}
+	second := models.SYBShop{DisplayName: "A店", NormalizedName: "legacy-two", Enabled: true}
+	if err := db.Create(&first).Error; err != nil {
+		t.Fatalf("创建第一条历史店铺失败: %v", err)
+	}
+	if err := db.Create(&second).Error; err != nil {
+		t.Fatalf("创建第二条历史店铺失败: %v", err)
+	}
+
+	updated, err := sybshop.ReconcileNormalizedNames(context.Background(), db)
+	if updated != 0 || err == nil || !strings.Contains(err.Error(), "normalized key conflict") {
+		t.Fatalf("冲突应失败且不报告更新: updated=%d err=%v", updated, err)
+	}
+	var rows []models.SYBShop
+	if err := db.Order("id ASC").Find(&rows).Error; err != nil {
+		t.Fatalf("读取冲突结果失败: %v", err)
+	}
+	if len(rows) != 2 || rows[0].NormalizedName != "legacy-one" || rows[1].NormalizedName != "legacy-two" {
+		t.Fatalf("冲突时不应修改任何键: %+v", rows)
+	}
+}
+
+func TestReconcileNormalizedNamesHandlesSwappedLegacyKeys(t *testing.T) {
+	db := openDB(t)
+	first := models.SYBShop{DisplayName: "Ａ", NormalizedName: "b", Enabled: true}
+	second := models.SYBShop{DisplayName: "Ｂ", NormalizedName: "a", Enabled: true}
+	if err := db.Create(&first).Error; err != nil {
+		t.Fatalf("创建第一条历史店铺失败: %v", err)
+	}
+	if err := db.Create(&second).Error; err != nil {
+		t.Fatalf("创建第二条历史店铺失败: %v", err)
+	}
+
+	updated, err := sybshop.ReconcileNormalizedNames(context.Background(), db)
+	if err != nil || updated != 2 {
+		t.Fatalf("交换键回填失败: updated=%d err=%v", updated, err)
+	}
+	var rows []models.SYBShop
+	if err := db.Order("id ASC").Find(&rows).Error; err != nil {
+		t.Fatalf("读取回填结果失败: %v", err)
+	}
+	if rows[0].NormalizedName != "a" || rows[1].NormalizedName != "b" {
+		t.Fatalf("交换键未正确回填: %+v", rows)
+	}
+}
diff --git a/server/cmd/migrate/migration/version-local/1787983900000_syb_shop_normalized_name_backfill.go b/server/cmd/migrate/migration/version-local/1787983900000_syb_shop_normalized_name_backfill.go
new file mode 100644
index 0000000..a2a524e
--- /dev/null
+++ b/server/cmd/migrate/migration/version-local/1787983900000_syb_shop_normalized_name_backfill.go
@@ -0,0 +1,32 @@
+package version_local
+
+import (
+	"context"
+	"runtime"
+
+	goautomigrations "go-admin/app/goauto/migrations"
+	"go-admin/app/goauto/sybshop"
+	"go-admin/cmd/migrate/migration"
+	common "go-admin/common/models"
+
+	"gorm.io/gorm"
+)
+
+// This migration repairs historical syb_shop.normalized_name values written
+// before all shop-name write paths used sybshop.Normalize (#213).
+func init() {
+	_, fileName, _, _ := runtime.Caller(0)
+	migration.Migrate.SetVersion(migration.GetFilename(fileName), migrateSYBShopNormalizedNameBackfill)
+}
+
+func migrateSYBShopNormalizedNameBackfill(db *gorm.DB, version string) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		if err := goautomigrations.Migrate(tx); err != nil {
+			return err
+		}
+		if _, err := sybshop.ReconcileNormalizedNames(context.Background(), tx); err != nil {
+			return err
+		}
+		return tx.Create(&common.Migration{Version: version}).Error
+	})
+}
diff --git a/server/cmd/migrate/migration/version-local/1787983900000_syb_shop_normalized_name_backfill_test.go b/server/cmd/migrate/migration/version-local/1787983900000_syb_shop_normalized_name_backfill_test.go
new file mode 100644
index 0000000..80cedf6
--- /dev/null
+++ b/server/cmd/migrate/migration/version-local/1787983900000_syb_shop_normalized_name_backfill_test.go
@@ -0,0 +1,51 @@
+package version_local
+
+import (
+	"testing"
+
+	goautomigrations "go-admin/app/goauto/migrations"
+	"go-admin/app/goauto/models"
+	common "go-admin/common/models"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+func TestMigrateSYBShopNormalizedNameBackfillRepairsLegacyRows(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open("file:"+t.Name()+"?mode=memory&cache=shared"), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Silent),
+	})
+	if err != nil {
+		t.Fatalf("打开测试数据库失败: %v", err)
+	}
+	if err := db.AutoMigrate(&common.Migration{}); err != nil {
+		t.Fatalf("创建迁移记录表失败: %v", err)
+	}
+	if err := goautomigrations.Migrate(db); err != nil {
+		t.Fatalf("创建 GoAuto 表失败: %v", err)
+	}
+	shop := models.SYBShop{DisplayName: "ＡＢＣ店", NormalizedName: "ＡＢＣ店", Enabled: true}
+	if err := db.Create(&shop).Error; err != nil {
+		t.Fatalf("创建历史店铺失败: %v", err)
+	}
+
+	const version = "1787983900000"
+	if err := migrateSYBShopNormalizedNameBackfill(db, version); err != nil {
+		t.Fatalf("执行回填迁移失败: %v", err)
+	}
+	var reloaded models.SYBShop
+	if err := db.First(&reloaded, shop.ID).Error; err != nil {
+		t.Fatalf("读取回填结果失败: %v", err)
+	}
+	if reloaded.NormalizedName != "abc店" {
+		t.Fatalf("迁移未回填规范化键: %q", reloaded.NormalizedName)
+	}
+	var records int64
+	if err := db.Model(&common.Migration{}).Where("version = ?", version).Count(&records).Error; err != nil {
+		t.Fatalf("读取迁移记录失败: %v", err)
+	}
+	if records != 1 {
+		t.Fatalf("迁移应留下一个版本记录，实际 %d", records)
+	}
+}