diff --git a/internal/lineage/sqlparser.go b/internal/lineage/sqlparser.go
index 28d533e..aeb3ba7 100644
--- a/internal/lineage/sqlparser.go
+++ b/internal/lineage/sqlparser.go
@@ -96,11 +96,13 @@ func (o *Op) GetID() string {
 	return o.SchemaName + "." + o.ProcName
 }
 
-func ParseUDF(sqlTree *depgraph.Graph, plpgsql string) error {
+func ParseUDF(plpgsql string) (*depgraph.Graph, error) {
+
+	sqlTree := depgraph.New()
 
 	raw, err := pg_query.ParsePlPgSqlToJSON(plpgsql)
 	if err != nil {
-		return err
+		return nil, err
 	}
 	// log.Debugf("pg_query.ParsePlPgSqlToJSON: %s", raw)
 
@@ -123,7 +125,7 @@ func ParseUDF(sqlTree *depgraph.Graph, plpgsql string) error {
 		})
 	}
 
-	return nil
+	return nil, err
 }
 
 func parseUDFOperator(sqlTree *depgraph.Graph, operator, plan string) error {
@@ -153,6 +155,16 @@ func parseUDFOperator(sqlTree *depgraph.Graph, operator, plan string) error {
 	return nil
 }
 
+func Parse(sql string) (*depgraph.Graph, error) {
+	sqlTree := depgraph.New()
+
+	if err := ParseSQL(sqlTree, sql); err != nil {
+		return nil, err
+	}
+
+	return sqlTree, nil
+}
+
 func ParseSQL(sqlTree *depgraph.Graph, sql string) error {
 
 	raw, err := pg_query.ParseToJSON(sql)
diff --git a/main.go b/main.go
index 7af5d90..1f74ff9 100644
--- a/main.go
+++ b/main.go
@@ -160,8 +160,6 @@ func generateTableJoinRelation(qs *QueryStore, ds *DataSource, driver neo4j.Driv
 func generateTableLineage(qs *QueryStore, ds *DataSource, driver neo4j.Driver) {
 
 	// 一个 UDF 一张图
-	sqlTree := depgraph.New(ds.Alias)
-
 	udf, err := IdentifyFuncCall(qs.Query)
 	if err != nil {
 		return
@@ -171,7 +169,8 @@ func generateTableLineage(qs *QueryStore, ds *DataSource, driver neo4j.Driver) {
 	// 	ProcName:   "func_insert_fact_sn_info_f6",
 	// 	SchemaName: "dw",
 	// }
-	if err := HandleUDF4Lineage(sqlTree, ds.DB, udf); err != nil {
+	sqlTree, err := HandleUDF4Lineage(ds.DB, udf)
+	if err != nil {
 		log.Errorf("HandleUDF %+v, err: %s", udf, err)
 		return
 	}
@@ -181,7 +180,9 @@ func generateTableLineage(qs *QueryStore, ds *DataSource, driver neo4j.Driver) {
 		log.Debugf("UDF Graph %d: %s\n", i, strings.Join(layer, ", "))
 	}
 
-	// TODO:完善辅助信息
+	// 设置所属命名空间，避免节点冲突
+	sqlTree.SetNamespace(ds.Alias)
+	// 完善辅助信息
 
 	if err := lineage.CreateGraph(driver, sqlTree.ShrinkGraph(), udf); err != nil {
 		log.Errorf("UDF CreateGraph err: %s ", err)
@@ -216,18 +217,18 @@ func IdentifyFuncCall(sql string) (*lineage.Op, error) {
 }
 
 // 解析函数调用
-func HandleUDF4Lineage(sqlTree *depgraph.Graph, db *sql.DB, udf *lineage.Op) error {
+func HandleUDF4Lineage(db *sql.DB, udf *lineage.Op) (*depgraph.Graph, error) {
 	log.Infof("HandleUDF: %s.%s", udf.SchemaName, udf.ProcName)
 
 	// 排除系统函数的干扰 e.g. select now()
 	if udf.SchemaName == "" || udf.SchemaName == "pg_catalog" {
-		return fmt.Errorf("UDF %s is system function", udf.ProcName)
+		return nil, fmt.Errorf("UDF %s is system function", udf.ProcName)
 	}
 
 	definition, err := GetUDFDefinition(db, udf)
 	if err != nil {
 		log.Errorf("GetUDFDefinition err: %s", err)
-		return err
+		return nil, err
 	}
 
 	// 字符串过滤，后期 pg_query 支持 set 了，可以去掉
@@ -235,12 +236,13 @@ func HandleUDF4Lineage(sqlTree *depgraph.Graph, db *sql.DB, udf *lineage.Op) err
 	plpgsql := filterUnhandledCommands(definition)
 	// log.Debug("plpgsql: ", plpgsql)
 
-	if err := lineage.ParseUDF(sqlTree, plpgsql); err != nil {
+	sqlTree, err := lineage.ParseUDF(plpgsql)
+	if err != nil {
 		log.Errorf("ParseUDF %+v, err: %s", udf, err)
-		return err
+		return nil, err
 	}
 
-	return nil
+	return sqlTree, nil
 }
 
 func HandleUDF4ERD(db *sql.DB, udf *lineage.Op) (map[string]*erd.RelationShip, error) {
diff --git a/pkg/depgraph/depgraph.go b/pkg/depgraph/depgraph.go
index 496d5bb..16bab42 100644
--- a/pkg/depgraph/depgraph.go
+++ b/pkg/depgraph/depgraph.go
@@ -34,12 +34,12 @@ type Graph struct {
 	namespace string
 }
 
-func New(namespace string) *Graph {
+func New() *Graph {
 	return &Graph{
 		dependencies: make(depmap),
 		dependents:   make(depmap),
 		nodes:        make(nodeset),
-		namespace:    namespace,
+		namespace:    "default",
 	}
 }
 
@@ -55,6 +55,10 @@ func (g *Graph) GetNamespace() string {
 	return g.namespace
 }
 
+func (g *Graph) SetNamespace(namespace string) {
+	g.namespace = namespace
+}
+
 // Add nodes and relationships
 func (g *Graph) DependOn(child Node, parent Node) error {
 	if child.GetID() == parent.GetID() {