diff --git a/hugegraph-api/src/main/java/com/baidu/hugegraph/api/API.java b/hugegraph-api/src/main/java/com/baidu/hugegraph/api/API.java
index 48aa9fefc4..eb46c97bf3 100644
--- a/hugegraph-api/src/main/java/com/baidu/hugegraph/api/API.java
+++ b/hugegraph-api/src/main/java/com/baidu/hugegraph/api/API.java
@@ -130,7 +130,8 @@ protected static void checkExist(Iterator<?> iter,
                                      String id) {
         if (!iter.hasNext()) {
             throw new NotFoundException(String.format(
-                      "%s with id '%s' does not exist", type, id));
+                      "%s with id '%s' does not exist",
+                      type.readableName(), id));
         }
     }
 
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/HugeGraph.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/HugeGraph.java
index 8471574150..cf531c0b9e 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/HugeGraph.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/HugeGraph.java
@@ -411,7 +411,7 @@ public Iterator<Edge> adjacentEdges(Id vertexId) {
 
     public PropertyKey propertyKey(Id id) {
         PropertyKey pk = this.schemaTransaction().getPropertyKey(id);
-        E.checkArgument(pk != null, "Undefined property key id: '%s'", id);
+        E.checkArgument(pk != null, "Undefined property key with id: '%s'", id);
         return pk;
     }
 
@@ -423,7 +423,7 @@ public PropertyKey propertyKey(String name) {
 
     public VertexLabel vertexLabel(Id id) {
         VertexLabel vl = this.schemaTransaction().getVertexLabel(id);
-        E.checkArgument(vl != null, "Undefined vertex label id: '%s'", id);
+        E.checkArgument(vl != null, "Undefined vertex label with id: '%s'", id);
         return vl;
     }
 
@@ -435,7 +435,7 @@ public VertexLabel vertexLabel(String name) {
 
     public EdgeLabel edgeLabel(Id id) {
         EdgeLabel el = this.schemaTransaction().getEdgeLabel(id);
-        E.checkArgument(el != null, "Undefined edge label id: '%s'", id);
+        E.checkArgument(el != null, "Undefined edge label with id: '%s'", id);
         return el;
     }
 
@@ -447,7 +447,7 @@ public EdgeLabel edgeLabel(String name) {
 
     public IndexLabel indexLabel(Id id) {
         IndexLabel il = this.schemaTransaction().getIndexLabel(id);
-        E.checkArgument(il != null, "Undefined index label id: '%s'", id);
+        E.checkArgument(il != null, "Undefined index label with id: '%s'", id);
         return il;
     }
 
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/AbstractTransaction.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/AbstractTransaction.java
index eb5c6c12e0..48674ac100 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/AbstractTransaction.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/AbstractTransaction.java
@@ -123,7 +123,8 @@ public BackendEntry get(HugeType type, Id id) {
         BackendEntry entry = this.query(type, id);
         if (entry == null) {
             throw new NotFoundException(
-                      "Not found the %s entry with id '%s'", type, id);
+                      "Not found the %s entry with id '%s'",
+                      type.readableName(), id);
         }
         return entry;
     }
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/SchemaTransaction.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/SchemaTransaction.java
index 4dc29cef74..996fa4bab3 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/SchemaTransaction.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/SchemaTransaction.java
@@ -280,7 +280,8 @@ protected void addSchema(SchemaElement schema) {
     }
 
     protected <T extends SchemaElement> T getSchema(HugeType type, Id id) {
-        LOG.debug("SchemaTransaction get {} by id '{}'", type, id);
+        LOG.debug("SchemaTransaction get {} by id '{}'",
+                  type.readableName(), id);
         this.beforeRead();
         BackendEntry entry = this.query(type, id);
         if (entry == null) {
@@ -300,7 +301,8 @@ protected <T extends SchemaElement> T getSchema(HugeType type, Id id) {
      */
     protected <T extends SchemaElement> T getSchema(HugeType type,
                                                     String name) {
-        LOG.debug("SchemaTransaction get {} by name '{}'", type, name);
+        LOG.debug("SchemaTransaction get {} by name '{}'",
+                  type.readableName(), name);
         this.beforeRead();
         ConditionQuery query = new ConditionQuery(type);
         query.eq(HugeKeys.NAME, name);
@@ -436,7 +438,7 @@ public void checkIdIfRestoringMode(HugeType type, Id id) {
                             "Must provide schema id if in RESTORING mode");
             SchemaElement element = this.getSchema(type, id);
             if (element != null) {
-                throw new ExistedException(type.toString() + " id", id);
+                throw new ExistedException(type.readableName() + " id", id);
             }
         }
     }
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/exception/ExistedException.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/exception/ExistedException.java
index ced6e56f1e..b4024f1457 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/exception/ExistedException.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/exception/ExistedException.java
@@ -20,11 +20,16 @@
 package com.baidu.hugegraph.exception;
 
 import com.baidu.hugegraph.HugeException;
+import com.baidu.hugegraph.type.HugeType;
 
 public class ExistedException extends HugeException {
 
     private static final long serialVersionUID = 5152465646323494840L;
 
+    public ExistedException(HugeType type, Object arg) {
+        this(type.readableName(), arg);
+    }
+
     public ExistedException(String type, Object arg) {
         super("The %s '%s' has existed", type, arg);
     }
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/SchemaManager.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/SchemaManager.java
index a99ac287dc..b469a909d1 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/SchemaManager.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/SchemaManager.java
@@ -113,7 +113,7 @@ public List<IndexLabel> getIndexLabels() {
     private static void checkExists(HugeType type, Object object, String name) {
         if (object == null) {
             throw new NotFoundException("%s with name '%s' does not exist",
-                                        type, name);
+                                        type.readableName(), name);
         }
     }
 }
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/EdgeLabelBuilder.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/EdgeLabelBuilder.java
index 266c40c403..b43402aa33 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/EdgeLabelBuilder.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/EdgeLabelBuilder.java
@@ -114,16 +114,17 @@ public EdgeLabel build() {
 
     @Override
     public EdgeLabel create() {
+        HugeType type = HugeType.EDGE_LABEL;
         SchemaTransaction tx = this.transaction;
         SchemaElement.checkName(this.name, tx.graph().configuration());
         EdgeLabel edgeLabel = tx.getEdgeLabel(this.name);
         if (edgeLabel != null) {
             if (this.checkExist) {
-                throw new ExistedException("edge label", this.name);
+                throw new ExistedException(type, this.name);
             }
             return edgeLabel;
         }
-        tx.checkIdIfRestoringMode(HugeType.EDGE_LABEL, this.id);
+        tx.checkIdIfRestoringMode(type, this.id);
 
         if (this.frequency == Frequency.DEFAULT) {
             this.frequency = Frequency.SINGLE;
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/IndexLabelBuilder.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/IndexLabelBuilder.java
index a33652215e..cc97c17b35 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/IndexLabelBuilder.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/IndexLabelBuilder.java
@@ -92,16 +92,17 @@ public IndexLabel build() {
      */
     @Override
     public IndexLabel.CreatedIndexLabel createWithTask() {
+        HugeType type = HugeType.INDEX_LABEL;
         SchemaTransaction tx = this.transaction;
         SchemaElement.checkName(this.name, tx.graph().configuration());
         IndexLabel indexLabel = tx.getIndexLabel(this.name);
         if (indexLabel != null) {
             if (this.checkExist) {
-                throw new ExistedException("index label", this.name);
+                throw new ExistedException(type, this.name);
             }
             return new IndexLabel.CreatedIndexLabel(indexLabel, null);
         }
-        tx.checkIdIfRestoringMode(HugeType.INDEX_LABEL, this.id);
+        tx.checkIdIfRestoringMode(type, this.id);
 
         SchemaLabel schemaLabel = this.loadElement();
 
@@ -290,7 +291,7 @@ private SchemaLabel loadElement() {
         }
 
         E.checkArgumentNotNull(schemaLabel, "Can't find the %s with name '%s'",
-                               this.baseType, this.baseValue);
+                               this.baseType.readableName(), this.baseValue);
         return schemaLabel;
     }
 
@@ -301,9 +302,10 @@ private void checkFields(Set<Id> propertyIds) {
         for (String field : fields) {
             PropertyKey pkey = this.transaction.getPropertyKey(field);
             // In general this will not happen
-            E.checkArgumentNotNull(pkey, "Can't build index on undefined " +
-                                   "property key '%s' for '%s': '%s'",
-                                   field, this.baseType, this.baseValue);
+            E.checkArgument(pkey != null,
+                            "Can't build index on undefined property key " +
+                            "'%s' for '%s': '%s'", field,
+                            this.baseType.readableName(), this.baseValue);
             E.checkArgument(pkey.cardinality() == Cardinality.SINGLE,
                             "Not allowed to build index on property key " +
                             "'%s' whose cardinality is list or set",
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/PropertyKeyBuilder.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/PropertyKeyBuilder.java
index 9e6393b0f5..fdfc0a7417 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/PropertyKeyBuilder.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/PropertyKeyBuilder.java
@@ -76,16 +76,17 @@ public PropertyKey build() {
 
     @Override
     public PropertyKey create() {
+        HugeType type = HugeType.PROPERTY_KEY;
         SchemaTransaction tx = this.transaction;
         SchemaElement.checkName(this.name, tx.graph().configuration());
         PropertyKey propertyKey = tx.getPropertyKey(this.name);
         if (propertyKey != null) {
             if (this.checkExist) {
-                throw new ExistedException("property key", this.name);
+                throw new ExistedException(type, this.name);
             }
             return propertyKey;
         }
-        tx.checkIdIfRestoringMode(HugeType.PROPERTY_KEY, this.id);
+        tx.checkIdIfRestoringMode(type, this.id);
 
         this.checkUserdata(Action.INSERT);
 
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/VertexLabelBuilder.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/VertexLabelBuilder.java
index 46eb1c0caf..fe2a6ed052 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/VertexLabelBuilder.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/schema/builder/VertexLabelBuilder.java
@@ -107,16 +107,17 @@ public VertexLabel build() {
 
     @Override
     public VertexLabel create() {
+        HugeType type = HugeType.VERTEX_LABEL;
         SchemaTransaction tx = this.transaction;
         SchemaElement.checkName(this.name, tx.graph().configuration());
         VertexLabel vertexLabel = tx.getVertexLabel(this.name);
         if (vertexLabel != null) {
             if (this.checkExist) {
-                throw new ExistedException("vertex label", this.name);
+                throw new ExistedException(type, this.name);
             }
             return vertexLabel;
         }
-        tx.checkIdIfRestoringMode(HugeType.VERTEX_LABEL, this.id);
+        tx.checkIdIfRestoringMode(type, this.id);
 
         this.checkProperties(Action.INSERT);
         this.checkIdStrategy();
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/type/HugeType.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/type/HugeType.java
index 7ffcc09050..9c49e0dc07 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/type/HugeType.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/type/HugeType.java
@@ -85,6 +85,10 @@ public String string() {
         return this.name;
     }
 
+    public String readableName() {
+        return this.name().replace('_', ' ').toLowerCase();
+    }
+
     public boolean isSchema() {
         return this == HugeType.VERTEX_LABEL ||
                this == HugeType.EDGE_LABEL ||