diff --git a/internal/auth/bootstrap.go b/internal/auth/bootstrap.go
index 50f56d21..de7b5a75 100644
--- a/internal/auth/bootstrap.go
+++ b/internal/auth/bootstrap.go
@@ -4,8 +4,8 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/jackc/pgx/v5/pgxpool"
 	"chat-agent-system/internal/config"
+	"github.com/jackc/pgx/v5/pgxpool"
 )
 
 // BootstrapAdminFromConfig 确保配置的管理员账户在 PG 中存在且具备 role-admin。
@@ -25,7 +25,9 @@ func BootstrapAdminFromConfig(ctx context.Context, store AuthStore, cfg *config.
 	existing, err := store.GetUserByUsername(ctx, adminUser)
 	if err == nil && existing != nil {
 		if existing.RoleID != "role-admin" {
-			_, _ = store.UpdateUserRole(ctx, existing.ID, "role-admin", "系统管理员")
+			if _, roleErr := store.UpdateUserRole(ctx, existing.ID, "role-admin", "系统管理员"); roleErr != nil {
+				return fmt.Errorf("bootstrap admin UpdateUserRole: %w", roleErr)
+			}
 		}
 		if existing.PasswordHash == "" {
 			hash, hashErr := HashPassword(adminPass)
@@ -86,14 +88,14 @@ func BootstrapDevSeedUsers(ctx context.Context, store AuthStore, cfg *config.Con
 			continue
 		}
 		_, err := store.CreateUser(ctx, &UserAccount{
-			Username:           su.username,
-			Name:               su.name,
-			PasswordHash:       passHash,
-			Status:             StatusActive,
-			RoleID:             su.roleID,
-			Position:           su.position,
-			Department:         su.dept,
-			EmployeeID:         su.empID,
+			Username:     su.username,
+			Name:         su.name,
+			PasswordHash: passHash,
+			Status:       StatusActive,
+			RoleID:       su.roleID,
+			Position:     su.position,
+			Department:   su.dept,
+			EmployeeID:   su.empID,
 		})
 		if err != nil {
 			return fmt.Errorf("seed user %s: %w", su.username, err)
diff --git a/internal/auth/bootstrap_test.go b/internal/auth/bootstrap_test.go
new file mode 100644
index 00000000..8a714f03
--- /dev/null
+++ b/internal/auth/bootstrap_test.go
@@ -0,0 +1,94 @@
+package auth_test
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+
+	"chat-agent-system/internal/auth"
+	"chat-agent-system/internal/config"
+)
+
+// failRoleStore wraps MemoryStore and forces UpdateUserRole to fail.
+type failRoleStore struct {
+	*auth.MemoryStore
+	failRole bool
+}
+
+func (s *failRoleStore) UpdateUserRole(ctx context.Context, id int64, roleID, position string) (*auth.UserAccount, error) {
+	if s.failRole {
+		return nil, errors.New("forced UpdateUserRole failure")
+	}
+	return s.MemoryStore.UpdateUserRole(ctx, id, roleID, position)
+}
+
+func TestBootstrapAdminFromConfig_PromotesExistingUserToAdmin(t *testing.T) {
+	cfg := &config.Config{
+		AdminUsername: "opsadmin",
+		AdminPassword: "bootstrap-pass-999",
+		Env:           "dev",
+	}
+	base := auth.NewMemoryStore(&config.Config{Env: "dev", AdminUsername: "other", AdminPassword: "x"})
+	ctx := context.Background()
+	created, err := base.CreateUser(ctx, &auth.UserAccount{
+		Username:     "opsadmin",
+		Name:         "临时账号",
+		PasswordHash: "hash",
+		Status:       auth.StatusActive,
+		RoleID:       "role-guest",
+		Position:     "访客/待指派",
+		EmployeeID:   "TMP-1",
+	})
+	if err != nil {
+		t.Fatalf("CreateUser: %v", err)
+	}
+	if created.RoleID == "role-admin" {
+		t.Fatal("precondition: seed must not already be role-admin")
+	}
+
+	if err := auth.BootstrapAdminFromConfig(ctx, base, cfg); err != nil {
+		t.Fatalf("BootstrapAdminFromConfig: %v", err)
+	}
+	got, err := base.GetUserByUsername(ctx, "opsadmin")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.RoleID != "role-admin" {
+		t.Fatalf("want role-admin after bootstrap, got %s", got.RoleID)
+	}
+	if got.Position != "系统管理员" {
+		t.Fatalf("want 系统管理员 position, got %s", got.Position)
+	}
+}
+
+func TestBootstrapAdminFromConfig_UpdateUserRoleErrorNotSwallowed(t *testing.T) {
+	cfg := &config.Config{
+		AdminUsername: "opsadmin2",
+		AdminPassword: "bootstrap-pass-999",
+		Env:           "dev",
+	}
+	base := auth.NewMemoryStore(&config.Config{Env: "dev", AdminUsername: "other", AdminPassword: "x"})
+	ctx := context.Background()
+	_, err := base.CreateUser(ctx, &auth.UserAccount{
+		Username:     "opsadmin2",
+		Name:         "临时账号",
+		PasswordHash: "hash",
+		Status:       auth.StatusActive,
+		RoleID:       "role-guest",
+		Position:     "访客/待指派",
+		EmployeeID:   "TMP-2",
+	})
+	if err != nil {
+		t.Fatalf("CreateUser: %v", err)
+	}
+
+	wrapped := &failRoleStore{MemoryStore: base, failRole: true}
+	err = auth.BootstrapAdminFromConfig(ctx, wrapped, cfg)
+	if err == nil {
+		t.Fatal("expected BootstrapAdminFromConfig to surface UpdateUserRole error")
+	}
+	if !strings.Contains(err.Error(), "UpdateUserRole") {
+		t.Fatalf("error should mention UpdateUserRole, got %v", err)
+	}
+}