diff --git a/test/sdp_test.go b/test/sdp_test.go
index e6a4f4b..31842ca 100644
--- a/test/sdp_test.go
+++ b/test/sdp_test.go
@@ -4,6 +4,7 @@ import (
 	"github.com/duke-git/lancet/v2/formatter"
 	"github.com/pion/sdp"
 	"io"
+	"net"
 	"regexp"
 	"strings"
 	"testing"
@@ -55,3 +56,48 @@ f=
 	pretty, _ := formatter.Pretty(session)
 	t.Logf("%s\n", pretty)
 }
+
+func TestSDP_Marshal(t *testing.T) {
+	description := sdp.NewJSEPSessionDescription(false)
+	description.SessionName = "Play"
+
+	description.ConnectionInformation = &sdp.ConnectionInformation{
+		NetworkType: "IN",
+		AddressType: "IP4",
+		Address:     &sdp.Address{IP: net.ParseIP("10.10.10.200")},
+	}
+
+	description.Origin.Username = "00000000000000000002"
+	description.Origin.SessionID = 0
+	description.Origin.SessionVersion = 0
+	description.Origin.UnicastAddress = "10.10.10.200"
+
+	media := &sdp.MediaDescription{
+		MediaName: sdp.MediaName{
+			Media:   "video",
+			Port:    sdp.RangedPort{Value: 5080},
+			Protos:  []string{"RTP", "AVP"},
+			Formats: []string{"99", "125", "126", "96", "97", "98"},
+		},
+		Attributes: []sdp.Attribute{
+			{Key: "rtpmap", Value: "99 H265/90000"},
+			{Key: "fmtp", Value: "125 profile-level-id=42e01e"},
+			{Key: "rtpmap", Value: "125 H264S/90000"},
+			{Key: "fmtp", Value: "126 profile-level-id=42e01e"},
+			{Key: "rtpmap", Value: "126 H264/90000"},
+			{Key: "rtpmap", Value: "96 PS/90000"},
+			{Key: "rtpmap", Value: "97 MPEG4/90000"},
+			{Key: "rtpmap", Value: "98 H264/90000"},
+			{Key: "sendonly"},
+		},
+	}
+
+	description.MediaDescriptions = append(description.MediaDescriptions, media)
+	sdpResp := description.Marshal()
+
+	// 添加 y= 和 f= 字段
+	sdpResp += "y=501000001\r\n"
+	sdpResp += "f=\r\n"
+
+	t.Logf("\n%s\n", sdpResp)
+}