diff --git a/internal/dms/pkg/constant/const.go b/internal/dms/pkg/constant/const.go
index 7377ed0e..c7c5c5c7 100644
--- a/internal/dms/pkg/constant/const.go
+++ b/internal/dms/pkg/constant/const.go
@@ -262,6 +262,8 @@ func ParseDBType(s string) (DBType, error) {
 		return DBTypeRedis, nil
 	case "OceanBase For Oracle":
 		return DBTypeOceanBaseOracle, nil
+	case "KingBase":
+		return DBTypeKingBase, nil
 
 	default:
 		return "", fmt.Errorf("invalid db type: %s", s)
@@ -288,6 +290,7 @@ const (
 	DBTypeMongoDB         DBType = "MongoDB"
 	DBTypeRedis           DBType = "Redis"
 	DBTypeOceanBaseOracle DBType = "OceanBase For Oracle"
+	DBTypeKingBase        DBType = "KingBase"
 )
 
 var supportedDataExportDBTypes = map[DBType]struct{}{
diff --git a/internal/dms/pkg/constant/const_test.go b/internal/dms/pkg/constant/const_test.go
index 1958f259..bdd5dc14 100644
--- a/internal/dms/pkg/constant/const_test.go
+++ b/internal/dms/pkg/constant/const_test.go
@@ -129,6 +129,7 @@ func TestParseDBType(t *testing.T) {
 		"PolarDB For MySQL": {input: "PolarDB For MySQL", expected: DBTypePolarDBForMySQL},
 		"MongoDB":           {input: "MongoDB", expected: DBTypeMongoDB},
 		"Redis":             {input: "Redis", expected: DBTypeRedis},
+		"KingBase":          {input: "KingBase", expected: DBTypeKingBase},
 		// "PolarDB" 单独不应匹配
 		"PolarDB only": {input: "PolarDB", expectError: true},
 		"invalid type": {input: "UnknownDB", expectError: true},
diff --git a/internal/sql_workbench/service/sql_workbench_service.go b/internal/sql_workbench/service/sql_workbench_service.go
index ee177152..a6c20793 100644
--- a/internal/sql_workbench/service/sql_workbench_service.go
+++ b/internal/sql_workbench/service/sql_workbench_service.go
@@ -1096,6 +1096,16 @@ func (sqlWorkbenchService *SqlWorkbenchService) fillDatasourceBaseInfo(datasourc
 		baseInfo.DefaultSchema = &databaseName
 	}
 
+	// KingBase：database_name → ODC defaultSchema；缺失则失败，禁止静默空默认库
+	if dbService.DBType == string(pkgConst.DBTypeKingBase) {
+		databaseNameParam := dbService.AdditionalParams.GetParam("database_name")
+		if databaseNameParam == nil || databaseNameParam.Value == "" {
+			return nil, fmt.Errorf("KingBase 数据源 %s 缺少 AdditionalParam database_name，请在数据源 AdditionalParams 中补充", dbService.Name)
+		}
+		databaseName := databaseNameParam.Value
+		baseInfo.DefaultSchema = &databaseName
+	}
+
 	return baseInfo, nil
 }
 
@@ -1187,6 +1197,8 @@ func (sqlWorkbenchService *SqlWorkbenchService) convertDBType(dmsDBType string)
 		return "REDIS"
 	case "DB2":
 		return "DB2"
+	case "KingBase":
+		return "KINGBASE"
 	default:
 		return dmsDBType
 	}
@@ -1203,7 +1215,8 @@ func (sqlWorkbenchService *SqlWorkbenchService) SupportDBType(dbType pkgConst.DB
 		dbType == pkgConst.DBTypePolarDBForMySQL ||
 		dbType == pkgConst.DBTypeGaussDB ||
 		dbType == pkgConst.DBTypePostgreSQL ||
-		dbType == pkgConst.DBTypeRedis
+		dbType == pkgConst.DBTypeRedis ||
+		dbType == pkgConst.DBTypeKingBase
 }
 
 func buildMongoDatasourceOptions(dbService *biz.DBService) (*string, interface{}, map[string]interface{}) {
diff --git a/internal/sql_workbench/service/sql_workbench_service_test.go b/internal/sql_workbench/service/sql_workbench_service_test.go
index af0d8408..9fe1c308 100644
--- a/internal/sql_workbench/service/sql_workbench_service_test.go
+++ b/internal/sql_workbench/service/sql_workbench_service_test.go
@@ -150,6 +150,7 @@ func Test_convertDBType(t *testing.T) {
 		"MongoDB":             {input: "MongoDB", expected: "MONGODB"},
 		"Redis":               {input: "Redis", expected: "REDIS"},
 		"DB2":                 {input: "DB2", expected: "DB2"},
+		"KingBase":            {input: "KingBase", expected: "KINGBASE"},
 		"Unknown passthrough": {input: "UnknownDB", expected: "UnknownDB"},
 	}
 	for name, tc := range cases {
@@ -183,6 +184,7 @@ func Test_SupportDBType(t *testing.T) {
 		"GaussDB supported":           {input: pkgConst.DBTypeGaussDB, expected: true},
 		"GaussDBForMySQL unsupported": {input: pkgConst.DBTypeGaussDBForMySQL, expected: false},
 		"DB2 unsupported":             {input: pkgConst.DBTypeDB2, expected: false},
+		"KingBase supported":          {input: pkgConst.DBTypeKingBase, expected: true},
 		"empty string unsupported":    {input: pkgConst.DBType(""), expected: false},
 		"unknown type unsupported":    {input: pkgConst.DBType("UnknownDBType"), expected: false},
 	}
@@ -390,6 +392,89 @@ func Test_buildDatasourceBaseInfo_DB2(t *testing.T) {
 	}
 }
 
+// Test_buildDatasourceBaseInfo_KingBase 覆盖 KingBase → defaultSchema 契约（S1 / AC-1）：
+//
+//	(a) 正例：database_name=test → DefaultSchema=="test" 且 Type 经 convert 为 KINGBASE
+//	(b) 负例：缺 database_name → err 含 "database_name"
+//	(c) MySQL 回归：DefaultSchema == nil
+func Test_buildDatasourceBaseInfo_KingBase(t *testing.T) {
+	svc := &SqlWorkbenchService{}
+	const envID = int64(1)
+	const datasourceName = "proj:kingbase_odc_test"
+
+	cases := map[string]struct {
+		dbService           *biz.DBService
+		expectErr           bool
+		expectErrSubstr     string
+		expectDefaultSchema *string
+		expectType          string
+	}{
+		"KingBase happy path": {
+			dbService: &biz.DBService{
+				Name:   "kingbase_odc_test",
+				DBType: string(pkgConst.DBTypeKingBase),
+				Host:   "10.186.16.126",
+				Port:   "1522",
+				User:   "kb_dev",
+				AdditionalParams: pkgParams.Params{
+					{Key: "database_name", Value: "test"},
+				},
+			},
+			expectErr:           false,
+			expectDefaultSchema: strPtr("test"),
+			expectType:          "KINGBASE",
+		},
+		"KingBase missing database_name": {
+			dbService: &biz.DBService{
+				Name:             "kingbase-missing-db",
+				DBType:           string(pkgConst.DBTypeKingBase),
+				AdditionalParams: pkgParams.Params{},
+			},
+			expectErr:       true,
+			expectErrSubstr: "database_name",
+		},
+		"MySQL regression still no DefaultSchema": {
+			dbService: &biz.DBService{
+				Name:             "mysql-1",
+				DBType:           "MySQL",
+				AdditionalParams: pkgParams.Params{},
+			},
+			expectErr:           false,
+			expectDefaultSchema: nil,
+			expectType:          "MYSQL",
+		},
+	}
+
+	for name, tc := range cases {
+		t.Run(name, func(t *testing.T) {
+			got, err := svc.fillDatasourceBaseInfo(datasourceName, tc.dbService, envID)
+			if tc.expectErr {
+				if err == nil {
+					t.Fatalf("expected error, got nil; baseInfo=%+v", got)
+				}
+				if tc.expectErrSubstr != "" && !strings.Contains(err.Error(), tc.expectErrSubstr) {
+					t.Errorf("error %q does not contain %q", err.Error(), tc.expectErrSubstr)
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if got == nil {
+				t.Fatalf("expected non-nil baseInfo")
+			}
+			if tc.expectType != "" && got.Type != tc.expectType {
+				t.Errorf("Type = %q, want %q", got.Type, tc.expectType)
+			}
+			if (got.DefaultSchema == nil) != (tc.expectDefaultSchema == nil) {
+				t.Errorf("DefaultSchema nil mismatch: got=%v, want=%v", got.DefaultSchema, tc.expectDefaultSchema)
+			} else if got.DefaultSchema != nil && tc.expectDefaultSchema != nil && *got.DefaultSchema != *tc.expectDefaultSchema {
+				t.Errorf("DefaultSchema = %q, want %q", *got.DefaultSchema, *tc.expectDefaultSchema)
+			}
+		})
+	}
+}
+
 func strPtr(s string) *string {
 	return &s
 }