diff --git a/hugegraph-api/src/main/java/com/baidu/hugegraph/api/traversers/NeighborRankAPI.java b/hugegraph-api/src/main/java/com/baidu/hugegraph/api/traversers/NeighborRankAPI.java
index 040bc7269f..4b7b38e51b 100644
--- a/hugegraph-api/src/main/java/com/baidu/hugegraph/api/traversers/NeighborRankAPI.java
+++ b/hugegraph-api/src/main/java/com/baidu/hugegraph/api/traversers/NeighborRankAPI.java
@@ -42,11 +42,11 @@
 
 import com.baidu.hugegraph.HugeGraph;
 import com.baidu.hugegraph.api.API;
-import com.baidu.hugegraph.api.graph.VertexAPI;
 import com.baidu.hugegraph.backend.id.Id;
 import com.baidu.hugegraph.core.GraphManager;
 import com.baidu.hugegraph.schema.EdgeLabel;
 import com.baidu.hugegraph.server.RestServer;
+import com.baidu.hugegraph.structure.HugeVertex;
 import com.baidu.hugegraph.traversal.algorithm.NeighborRankTraverser;
 import com.baidu.hugegraph.type.define.Directions;
 import com.baidu.hugegraph.util.E;
@@ -82,7 +82,7 @@ public String neighborRank(@Context GraphManager manager,
                   "alpha '{}' and capacity '{}'", graph, request.source,
                   request.steps, request.alpha, request.capacity);
 
-        Id sourceId = VertexAPI.checkAndParseVertexId(request.source);
+        Id sourceId = HugeVertex.getIdValue(request.source);
         HugeGraph g = graph(manager, graph);
 
         List<NeighborRankTraverser.Step> steps = steps(g, request);
diff --git a/hugegraph-api/src/main/java/com/baidu/hugegraph/api/traversers/PersonalRankAPI.java b/hugegraph-api/src/main/java/com/baidu/hugegraph/api/traversers/PersonalRankAPI.java
index 17d6ae35e1..8f6445ffaa 100644
--- a/hugegraph-api/src/main/java/com/baidu/hugegraph/api/traversers/PersonalRankAPI.java
+++ b/hugegraph-api/src/main/java/com/baidu/hugegraph/api/traversers/PersonalRankAPI.java
@@ -37,10 +37,10 @@
 
 import com.baidu.hugegraph.HugeGraph;
 import com.baidu.hugegraph.api.API;
-import com.baidu.hugegraph.api.graph.VertexAPI;
 import com.baidu.hugegraph.backend.id.Id;
 import com.baidu.hugegraph.core.GraphManager;
 import com.baidu.hugegraph.server.RestServer;
+import com.baidu.hugegraph.structure.HugeVertex;
 import com.baidu.hugegraph.traversal.algorithm.PersonalRankTraverser;
 import com.baidu.hugegraph.util.CollectionUtil;
 import com.baidu.hugegraph.util.E;
@@ -87,7 +87,7 @@ public String personalRank(@Context GraphManager manager,
                   graph, request.source, request.label, request.alpha,
                   request.degree, request.maxDepth, request.sorted);
 
-        Id sourceId = VertexAPI.checkAndParseVertexId(request.source);
+        Id sourceId = HugeVertex.getIdValue(request.source);
         HugeGraph g = graph(manager, graph);
 
         PersonalRankTraverser traverser;
@@ -140,7 +140,7 @@ private static class RankRequest {
 
         @Override
         public String toString() {
-            return String.format("RankRequest{source=%s,label=%s,alpha=%s" +
+            return String.format("RankRequest{source=%s,label=%s,alpha=%s," +
                                  "degree=%s,limit=%s,maxDepth=%s," +
                                  "withLabel=%s,sorted=%s}",
                                  this.source, this.label, this.alpha,
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/NeighborRankTraverser.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/NeighborRankTraverser.java
index 0766811d49..5bebb02287 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/NeighborRankTraverser.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/NeighborRankTraverser.java
@@ -37,7 +37,6 @@
 import com.baidu.hugegraph.type.define.Directions;
 import com.baidu.hugegraph.util.E;
 import com.baidu.hugegraph.util.OrderLimitMap;
-import com.google.common.collect.ImmutableList;
 
 public class NeighborRankTraverser extends HugeTraverser {