diff --git a/DProto/SK.xml b/DProto/SK.xml
new file mode 100644
index 0000000..6f46dd3
--- /dev/null
+++ b/DProto/SK.xml
@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<packet extend="base">
+    <req>
+        <command>
+            <hex>SK</hex>
+        </command>
+        <data extend = "data">
+            <nRandomSize len="4" cn="产生随机数长度">
+                需要产生的随机数长度
+                注意: 最大不超过4K
+            </nRandomSize>
+        </data>
+    </req>
+    <res>
+
+        <command>
+            <hex>SL</hex>
+        </command>
+        <data>
+            <error len="2" cn="错误码" format="X" :catch="catchError('%s')">
+                <options>
+                    <option cn="无错误">
+                        <hex>00</hex>
+                    </option>
+                    <option cn="无效的哈希标识">
+                        <hex>05</hex>
+                    </option>
+                    <option cn="输入数据有误">
+                        <hex>15</hex>
+                    </option>
+                    <option cn="DSP:错误，报告给管理员">
+                        <hex>47</hex>
+                    </option>
+                    <option cn="数据长度错误">
+                        <hex>80</hex>
+                    </option>
+                </options>
+            </error>
+
+            <random maxLen="255" :len="getRandomSize()" cn="产生的随机数"></random>
+
+        </data>
+
+    </res>
+    <script>function getRandomSize(){
+        var data = $packet.data;
+        return data.nRandomSize;
+
+        }
+    </script>
+</packet>
diff --git a/doc/java接口说明文档.docx b/doc/java接口说明文档.docx
index 3c9bc04..d4dc478 100644
Binary files a/doc/java接口说明文档.docx and b/doc/java接口说明文档.docx differ
diff --git a/src/main/java/com/sunyard/inf/SydZYOption.java b/src/main/java/com/sunyard/inf/SydZYOption.java
index 8dc28d2..d6489bb 100644
--- a/src/main/java/com/sunyard/inf/SydZYOption.java
+++ b/src/main/java/com/sunyard/inf/SydZYOption.java
@@ -255,4 +255,10 @@ public interface SydZYOption {
     byte[] decryptByMainAndSYMEn(String encryptKeyIndex, int encryptAlgFlag, byte[] encryptIv, int encryptKeyDivNum,
                                  List<byte[]> encryptKeyDivData, int[] encryptKeyDivAlgFlag, List<byte[]> encryptKeyDivIv, byte[] inputData);
 
+    /**
+     * 产生随机数
+     * @param nRandomSize 产生随机数长度
+     * @return 随机数
+     */
+    String GenRandom(int nRandomSize);
 }
diff --git a/src/main/java/racal/sunyard/main/SydApi4j.java b/src/main/java/racal/sunyard/main/SydApi4j.java
index f607bcd..c5f4323 100644
--- a/src/main/java/racal/sunyard/main/SydApi4j.java
+++ b/src/main/java/racal/sunyard/main/SydApi4j.java
@@ -9932,5 +9932,40 @@ public class SydApi4j implements SydApi {
         }
     }
 
+    @Override
+    public String GenRandom(int nRandomSize) {
+        //获取协议
+        ProtoSK proto = new ProtoSK();
+
+        //填充数据
+        PacketSN sn = PacketSN.gen();
+        HashMap<String, Object> packet = new HashMap<String, Object>();
+        packet.put("header", sn.getSn().array());
+        HashMap<String, Object> data = new HashMap<String, Object>();
+        data.put("nRandomSize", nRandomSize);
+        packet.put("data", data);
+
+        //渲染发送
+        ByteBuffer bb = proto.rend(packet);
+
+        synchronized (this) {
+            //解析响应
+            bb = syncRead(syncSend(bb));
+        }
+        Packet p = proto.parse(bb, packet);
+        Map<String, Object> ret = p.toMap();
+        if (
+                !Arrays.equals(sn.getSn().array(), ((PacketSection) ret.get("header")).getBytes())
+        ) {
+            throw new SydApiException("包序号不匹配", -4);
+        }
+        ret = (Map<String, Object>) ret.get("data");
+        PacketSection error = (PacketSection) ret.get("error");
+        if (!"00".equals(error.getString())) {
+            throw new SydApiException(error.getInfo(), error.autoInt());
+        }
+        return Util.bytes2HexString(((PacketSection) ret.get("random")).getBytes());
+    }
+
     // ---------------------中移指令结束--------------------------------
 }