diff --git a/metadata/definition/definition.go b/metadata/definition/definition.go
index 2cb11e3984..d4d5780033 100644
--- a/metadata/definition/definition.go
+++ b/metadata/definition/definition.go
@@ -37,10 +37,10 @@ type ServiceDefiner interface {
 
 // ServiceDefinition is the describer of service definition
 type ServiceDefinition struct {
-	CanonicalName string
-	CodeSource    string
-	Methods       []MethodDefinition
-	Types         []TypeDefinition
+	CanonicalName string             `json:"canonicalName"`
+	CodeSource    string             `json:"codeSource"`
+	Methods       []MethodDefinition `json:"methods"`
+	Types         []TypeDefinition   `json:"types"`
 }
 
 // ToBytes convert ServiceDefinition to json string
@@ -71,26 +71,26 @@ func (def *ServiceDefinition) String() string {
 
 // FullServiceDefinition is the describer of service definition with parameters
 type FullServiceDefinition struct {
-	Parameters map[string]string
+	Parameters map[string]string `json:"parameters"`
 	ServiceDefinition
 }
 
 // MethodDefinition is the describer of method definition
 type MethodDefinition struct {
-	Name           string
-	ParameterTypes []string
-	ReturnType     string
-	Parameters     []TypeDefinition
+	Name           string           `json:"name"`
+	ParameterTypes []string         `json:"parameterTypes"`
+	ReturnType     string           `json:"returnType"`
+	Parameters     []TypeDefinition `json:"parameters"`
 }
 
 // TypeDefinition is the describer of type definition
 type TypeDefinition struct {
-	ID              string
-	Type            string
-	Items           []TypeDefinition
-	Enums           []string
-	Properties      map[string]TypeDefinition
-	TypeBuilderName string
+	ID              string                    `json:"id"`
+	Type            string                    `json:"type"`
+	Items           []TypeDefinition          `json:"items"`
+	Enums           []string                  `json:"enums"`
+	Properties      map[string]TypeDefinition `json:"properties"`
+	TypeBuilderName string                    `json:"typeBuilderName"`
 }
 
 // BuildServiceDefinition can build service definition which will be used to describe a service
diff --git a/metadata/identifier/base_metadata_identifier.go b/metadata/identifier/base_metadata_identifier.go
index cdfeac787e..7df3e6c3af 100644
--- a/metadata/identifier/base_metadata_identifier.go
+++ b/metadata/identifier/base_metadata_identifier.go
@@ -21,6 +21,10 @@ import (
 	"net/url"
 )
 
+import (
+	"github.com/dubbogo/gost/log/logger"
+)
+
 import (
 	"dubbo.apache.org/dubbo-go/v3/common/constant"
 )
@@ -43,6 +47,10 @@ type BaseMetadataIdentifier struct {
 func joinParams(joinChar string, params []string) string {
 	var joinedStr string
 	for _, param := range params {
+		if param == "" {
+			logger.Info("[Metadata report] Break loop in `joinParams` to avoid invalid path when meeting empty param")
+			break
+		}
 		joinedStr += joinChar
 		joinedStr += param
 	}
diff --git a/metadata/report/delegate/delegate_report.go b/metadata/report/delegate/delegate_report.go
index 70a12ac226..d57b35f8ab 100644
--- a/metadata/report/delegate/delegate_report.go
+++ b/metadata/report/delegate/delegate_report.go
@@ -304,7 +304,7 @@ func (mr *MetadataReport) doHandlerMetadataCollection(metadataMap map[*identifie
 	}
 	for e := range metadataMap {
 		if common.RoleType(common.PROVIDER).Role() == e.Side {
-			mr.StoreProviderMetadata(e, metadataMap[e].(*definition.ServiceDefinition))
+			mr.StoreProviderMetadata(e, metadataMap[e].(*definition.FullServiceDefinition))
 		} else if common.RoleType(common.CONSUMER).Role() == e.Side {
 			mr.StoreConsumerMetadata(e, metadataMap[e].(map[string]string))
 		}
diff --git a/metadata/service/local/service_test.go b/metadata/service/local/service_test.go
index 031c8a56b1..c1e952c873 100644
--- a/metadata/service/local/service_test.go
+++ b/metadata/service/local/service_test.go
@@ -99,16 +99,16 @@ func TestMetadataService(t *testing.T) {
 	assert.NoError(t, err)
 	err = mts.PublishServiceDefinition(u)
 	assert.NoError(t, err)
-	expected := "{\"Parameters\":{\"anyhost\":\"true\",\"application\":\"BDTService\"," +
+	expected := "{\"parameters\":{\"anyhost\":\"true\",\"application\":\"BDTService\"," +
 		"\"bean.name\":\"UserProvider\",\"category\":\"providers\",\"default.timeout\":\"10000\"," +
 		"\"dubbo\":\"dubbo-provider-golang-1.0.0\",\"environment\":\"dev\",\"group\":\"group1\"," +
 		"\"interface\":\"com.ikurento.user.UserProvider\",\"ip\":\"192.168.56.1\"," +
 		"\"methods\":\"GetUser\",\"module\":\"dubbogo user-info server\",\"org\":\"ikurento.com\"," +
 		"\"owner\":\"ZX\",\"pid\":\"1447\",\"revision\":\"0.0.1\",\"side\":\"provider\"," +
 		"\"timeout\":\"3000\",\"timestamp\":\"1556509797245\",\"version\":\"0.0.1\"}," +
-		"\"CanonicalName\":\"com.ikurento.user.UserProvider\",\"CodeSource\":\"\"," +
-		"\"Methods\":[{\"Name\":\"GetUser\",\"ParameterTypes\":[\"slice\"],\"ReturnType\":\"ptr\"," +
-		"\"Parameters\":null}],\"Types\":null}"
+		"\"canonicalName\":\"com.ikurento.user.UserProvider\",\"codeSource\":\"\"," +
+		"\"methods\":[{\"name\":\"GetUser\",\"parameterTypes\":[\"slice\"],\"returnType\":\"ptr\"," +
+		"\"parameters\":null}],\"types\":null}"
 	def1, err := mts.GetServiceDefinition(serviceName, group, version)
 	assert.Equal(t, expected, def1)
 	assert.NoError(t, err)
diff --git a/metadata/service/remote/service_test.go b/metadata/service/remote/service_test.go
index fa4a17e984..e435ef7a4e 100644
--- a/metadata/service/remote/service_test.go
+++ b/metadata/service/remote/service_test.go
@@ -146,17 +146,16 @@ func TestMockInmemoryProc(t *testing.T) {
 	err = mts.PublishServiceDefinition(u)
 	assert.NoError(t, err)
 
-	expected := "{\"Parameters\":{\"anyhost\":\"true\",\"application\":\"BDTService\"," +
+	expected := "{\"parameters\":{\"anyhost\":\"true\",\"application\":\"BDTService\"," +
 		"\"bean.name\":\"UserProvider\",\"category\":\"providers\",\"default.timeout\":\"10000\"," +
 		"\"dubbo\":\"dubbo-provider-golang-1.0.0\",\"environment\":\"dev\",\"group\":\"group1\"," +
 		"\"interface\":\"com.ikurento.user.UserProvider\",\"ip\":\"192.168.56.1\"," +
 		"\"methods\":\"GetUser\",\"module\":\"dubbogo user-info server\",\"org\":\"ikurento.com\"," +
 		"\"owner\":\"ZX\",\"pid\":\"1447\",\"revision\":\"0.0.1\",\"side\":\"provider\"," +
 		"\"timeout\":\"3000\",\"timestamp\":\"1556509797245\",\"version\":\"0.0.1\"}," +
-		"\"CanonicalName\":\"com.ikurento.user.UserProvider\",\"CodeSource\":\"\"," +
-		"\"Methods\":[{\"Name\":\"GetUser\",\"ParameterTypes\":[\"slice\"],\"ReturnType\":\"ptr\"," +
-		"\"Parameters\":null}],\"Types\":null}"
-
+		"\"canonicalName\":\"com.ikurento.user.UserProvider\",\"codeSource\":\"\"," +
+		"\"methods\":[{\"name\":\"GetUser\",\"parameterTypes\":[\"slice\"],\"returnType\":\"ptr\"," +
+		"\"parameters\":null}],\"types\":null}"
 	def1, _ := mts.GetServiceDefinition(serviceName, group, version)
 	assert.Equal(t, expected, def1)
 	serviceKey := definition.ServiceDescriperBuild(serviceName, group, version)