diff --git a/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/FormatField.java b/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/FormatField.java
new file mode 100644
index 0000000..b735c45
--- /dev/null
+++ b/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/FormatField.java
@@ -0,0 +1,74 @@
+package cn.skcks.docking.gb28181.mocking.core.sip.gb28181.sdp;
+
+import com.fasterxml.jackson.databind.json.JsonMapper;
+import gov.nist.core.Separators;
+import gov.nist.javax.sdp.fields.SDPField;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
+
+@Slf4j
+@EqualsAndHashCode(callSuper = true)
+@Data
+@AllArgsConstructor
+public class FormatField extends SDPField {
+    public static final String FORMAT_FIELD_NAME = "f";
+    private static final String FORMAT_FIELD = FORMAT_FIELD_NAME + "=";
+    public FormatField() {
+        super(FORMAT_FIELD);
+    }
+
+    /**
+     * 视频编码格式
+     */
+    private String videoFormat = "";
+    /**
+     * 视频分辨率
+     */
+    private String videoRatio = "";
+    /**
+     * 视频帧率
+     */
+    private String videoFrame = "";
+    /**
+     * 视频码率类型
+     */
+    private String videoRateType = "";
+    /**
+     * 视频码率大小
+     */
+    private String videoRateNum = "";
+    /**
+     * 音频编码格式
+     */
+    private String audioFormat = "";
+    /**
+     * 音频码率大小
+     */
+    private String audioRateNum = "";
+    /**
+     * 音频采样率
+     */
+    private String audioSampling = "";
+
+    @SneakyThrows
+    @Override
+    public String encode() {
+        StringBuilder stringBuilder = new StringBuilder();
+        stringBuilder.append(FORMAT_FIELD);
+        if(!StringUtils.isAllBlank(videoFormat, videoRatio, videoFrame, videoRateType, videoRateNum,audioFormat, audioRateNum, audioSampling)){
+            String video = StringUtils.joinWith("/", "v", videoFormat, videoRatio, videoFrame, videoRateType, videoRateNum);
+            String audio = StringUtils.joinWith("/", "a", audioFormat, audioRateNum, audioSampling);
+            stringBuilder.append(StringUtils.joinWith("/",video,audio));
+        }
+        stringBuilder.append(Separators.NEWLINE);
+        return stringBuilder.toString();
+    }
+
+    public String toString(){
+        return encode();
+    }
+}
diff --git a/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/FormatFieldParser.java b/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/FormatFieldParser.java
new file mode 100644
index 0000000..c538486
--- /dev/null
+++ b/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/FormatFieldParser.java
@@ -0,0 +1,75 @@
+package cn.skcks.docking.gb28181.mocking.core.sip.gb28181.sdp;
+
+import gov.nist.javax.sdp.fields.SDPField;
+import gov.nist.javax.sdp.parser.Lexer;
+import gov.nist.javax.sdp.parser.SDPParser;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
+
+import java.text.ParseException;
+
+@Slf4j
+public class FormatFieldParser extends SDPParser {
+    public FormatFieldParser(String ssrcField) {
+        this.lexer = new Lexer("charLexer", ssrcField);
+    }
+
+    public FormatField formatField() throws ParseException {
+        try {
+            this.lexer.match('f');
+            this.lexer.SPorHT();
+            this.lexer.match('=');
+            this.lexer.SPorHT();
+
+            FormatField formatField = new FormatField();
+            String rest = lexer.getRest().trim();
+
+            String[] split = StringUtils.split(rest, 'a');
+            if(split.length == 0){
+                return formatField;
+            }
+
+            log.info("{}", (Object) split);
+            String video = split[0];
+            String[] videoParams = StringUtils.split(video,"/");
+            log.info("{}", (Object) videoParams);
+            if(videoParams.length > 1){
+                formatField.setVideoFormat(videoParams[1]);
+            }
+            if(videoParams.length > 2){
+                formatField.setVideoRatio(videoParams[2]);
+            }
+            if(videoParams.length > 3){
+                formatField.setVideoFrame(videoParams[3]);
+            }
+            if(videoParams.length > 4){
+                formatField.setVideoRateType(videoParams[4]);
+            }
+            if(videoParams.length > 5){
+                formatField.setVideoRateNum(videoParams[5]);
+            }
+            if(split.length < 2){
+                return formatField;
+            }
+            String audio = split[1];
+            String[] audioParams = audio.split("/");
+            if(audioParams.length > 0){
+                formatField.setAudioFormat(audioParams[0]);
+            }
+            if(audioParams.length > 1){
+                formatField.setAudioRateNum(audioParams[1]);
+            }
+            if(audioParams.length > 2){
+                formatField.setAudioSampling(audioParams[2]);
+            }
+            return formatField;
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw lexer.createParseException();
+        }
+    }
+
+    public SDPField parse() throws ParseException {
+        return this.formatField();
+    }
+}
diff --git a/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/GB28181DescriptionParserFactory.java b/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/GB28181DescriptionParserFactory.java
index 693d013..bb1cf9c 100644
--- a/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/GB28181DescriptionParserFactory.java
+++ b/gb28181-mocking-service/src/main/java/cn/skcks/docking/gb28181/mocking/core/sip/gb28181/sdp/GB28181DescriptionParserFactory.java
@@ -12,6 +12,9 @@ public class GB28181DescriptionParserFactory {
         if(fieldName.equalsIgnoreCase("y")){
             return new SsrcFieldParser(field);
         }
+        if(fieldName.equalsIgnoreCase("f")){
+            return new FormatFieldParser(field);
+        }
         return ParserFactory.createParser(field);
     }
 }