diff --git a/cmd/diff_test.go b/cmd/diff_test.go
index 5fa4670..d8a6426 100644
--- a/cmd/diff_test.go
+++ b/cmd/diff_test.go
@@ -104,7 +104,3 @@ func TestDoDiffForLocalProfiles(t *testing.T) {
 	}
 
 }
-
-func TestDoDiffUnderProw(t *testing.T) {
-
-}
diff --git a/cmd/profile.go b/cmd/profile.go
index 16e98fd..7c84d47 100644
--- a/cmd/profile.go
+++ b/cmd/profile.go
@@ -19,11 +19,11 @@ package cmd
 import (
 	"bytes"
 	"fmt"
-	log "github.com/sirupsen/logrus"
 	"io"
 	"os"
 
 	"github.com/qiniu/goc/pkg/cover"
+	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
 
@@ -74,16 +74,24 @@ goc profile --force
 	},
 }
 
-var output string
-var force bool
-var svrList []string
-var addrList []string
+var (
+	svrList  []string // --service flag
+	addrList []string // --address flag
+	force    bool     // --force flag
+	output   string   // --output flag
+	coverPkg []string // --coverpkg flag
+)
 
 func init() {
 	profileCmd.Flags().StringVarP(&output, "output", "o", "", "download cover profile")
 	profileCmd.Flags().StringSliceVarP(&svrList, "service", "", nil, "service name to fetch profile, see 'goc list' for all services.")
 	profileCmd.Flags().StringSliceVarP(&addrList, "address", "", nil, "address to fetch profile, see 'goc list' for all addresses.")
 	profileCmd.Flags().BoolVarP(&force, "force", "f", false, "force fetching all available profiles")
+	profileCmd.Flags().StringSliceVarP(&coverPkg, "coverpkg", "", nil, "only output coverage data of the packages matching the patterns")
 	addBasicFlags(profileCmd.Flags())
 	rootCmd.AddCommand(profileCmd)
 }
+
+func filterProfile() {
+
+}
diff --git a/pkg/cover/server.go b/pkg/cover/server.go
index 0d09f52..a039588 100644
--- a/pkg/cover/server.go
+++ b/pkg/cover/server.go
@@ -25,6 +25,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"regexp"
 	"strconv"
 
 	"github.com/gin-gonic/gin"
@@ -83,11 +84,13 @@ type Service struct {
 	Address string `form:"address" json:"address" binding:"required"`
 }
 
-// ProfileParam is param of profile API (TODO)
+// ProfileParam is param of profile API
 type ProfileParam struct {
 	Force   bool     `form:"force"`
 	Service []string `form:"service" json:"service"`
 	Address []string `form:"address" json:"address"`
+
+	CoverPkg []string
 }
 
 //listServices list all the registered services
@@ -138,6 +141,7 @@ func profile(c *gin.Context) {
 		c.JSON(http.StatusExpectationFailed, gin.H{"error": "invalid param"})
 		return
 	}
+
 	serviceList := removeDuplicateElement(c.QueryArray("service"))
 	addressList := removeDuplicateElement(c.QueryArray("address"))
 	allInfos := DefaultStore.GetAll()
@@ -183,6 +187,25 @@ func profile(c *gin.Context) {
 	}
 }
 
+// filterProfile output profiles of the packages matching the coverPkg
+func filterProfile(coverPkg []string, profiles []*cover.Profile) ([]*cover.Profile, error) {
+	var out = make([]*cover.Profile, 0)
+
+	for _, profile := range profiles {
+		for _, pattern := range coverPkg {
+			matched, err := regexp.MatchString(pattern, profile.FileName)
+			if err != nil {
+				return nil, fmt.Errorf("filterProfile failed with pattern %s for profile %s", pattern, profile.FileName)
+			}
+			if matched {
+				out = append(out, profile)
+			}
+		}
+	}
+
+	return out, nil
+}
+
 func clear(c *gin.Context) {
 	svrsUnderTest := DefaultStore.GetAll()
 	for svc, addrs := range svrsUnderTest {
diff --git a/pkg/cover/server_test.go b/pkg/cover/server_test.go
index 806c63a..4df5c45 100644
--- a/pkg/cover/server_test.go
+++ b/pkg/cover/server_test.go
@@ -214,3 +214,12 @@ func TestInitService(t *testing.T) {
 	assert.Equal(t, http.StatusInternalServerError, w.Code)
 	assert.Contains(t, w.Body.String(), "lala error")
 }
+
+func TestFilterProfile(t *testing.T) {
+	// var tcs = []struct {
+	// 	pattern  []string
+	// 	profile  []*cover.Profile
+	// 	expected []*cover.Profile
+	// 	err      error
+	// }{}
+}