diff --git a/sample/sample-client.c b/sample/sample-client.c
index cf374a7..5b27ad9 100644
--- a/sample/sample-client.c
+++ b/sample/sample-client.c
@@ -12,12 +12,12 @@
 char buf[SAMPLE_SEC_BUF_SIZE];
 
 static sasl_conn_t *conn = NULL;
-char *realm = "DOMAIN.COM";
-char *mech = "gssapi";
-char *iplocal = "127.0.0.1";
-char *ipremote = "127.0.0.1";
+const char *realm = "DOMAIN.COM";
+const char *mech = "gssapi";
+const char *iplocal = "127.0.0.1";
+const char *ipremote = "127.0.0.1";
 char *searchpath = NULL;
-char *service = "zeekling";
+const char *service = "zeekling";
 int cfd;
 
 int init_sasl() {
@@ -30,8 +30,8 @@ int init_sasl() {
 }
 
 int connect_server() {
-	struct sockaddr_in s_add,c_add;
-	unsigned short portnum=2345;
+	struct sockaddr_in s_add, c_add;
+	unsigned short portnum = 2345;
 	printf("Hello,welcome to client !\r\n");
 	cfd = socket(AF_INET, SOCK_STREAM, 0);
 	if(-1 == cfd) {
@@ -63,7 +63,7 @@ int main() {
     const char *chosenmech;
 	int serverlast = 0;
 	unsigned len;
-	char *fqdn = "";
+	const char *fqdn = "";
 	char *userid = NULL;
 	char *authid = NULL;
 
diff --git a/sample/sample-server.c b/sample/sample-server.c
index 626d242..f5ca709 100644
--- a/sample/sample-server.c
+++ b/sample/sample-server.c
@@ -1,3 +1,5 @@
+
+#include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <stdio.h>
@@ -6,7 +8,7 @@
 #include <string.h>
 #include <sasl/sasl.h>
 
-int sfp; /* 定义两个描述符 */
+int sfp;
 struct sockaddr_in s_add,c_add;
 int sin_size;
 
@@ -14,10 +16,11 @@ typedef struct kClient {
 	int fp;
 	int auth_complete;
 	int begin_auth;
+	sasl_conn_t *conn;
 } kClient;
 
 int listen_port() {
-	unsigned short portnum=2345; /* 服务端使用端口 */
+	unsigned short portnum=2345;
 
 	sfp = socket(AF_INET, SOCK_STREAM, 0);
 	if(-1 == sfp) {
@@ -50,12 +53,51 @@ kClient *createClient(int fp) {
 	kClient *c = malloc(sizeof(kClient));
 	c->fp = fp;
 	c->auth_complete = -1;
-	c->begin_auth = -1;
+	c->begin_auth = 0;
+	c->conn = NULL;
 	return c;
 }
 
 int auth_client(kClient *c) {
-
+	if (!c->begin_auth && sasl_server_new("sample", "DOMAIN.COM",
+				"DOMAIN.COM", "127.0.0.1", "127.0.0.1", NULL,
+				0, &c->conn) == SASL_OK) {
+		printf("Allocating sasl connection state");
+		return 1;
+	}
+	const char *mech = "GSSAPI";
+	int recbytes;
+	char buffer[1024]={0};
+	if ((recbytes = read(c->fp, buffer, 1024)) == -1) {
+		printf("read failed");
+		close(c->fp);
+		return 1;
+	}
+	buffer[recbytes] = '\0';
+	char *out;
+	unsigned len = 0;
+	int result = sasl_server_start(c->conn, mech, buffer, recbytes, &out, &len);
+	if (result != SASL_OK && result != SASL_CONTINUE) {
+		printf("auth failed ");
+		write(c->fp, "auth failed", 11);
+		close(c->fp);
+	}
+	while (result == SASL_CONTINUE) {
+		if (write(c->fp, out, len) == -1) {
+			printf("write failed");
+			return 1;
+		}
+		if (recbytes = read(c->fp, buffer, 1024)) {
+			printf("write failed");
+			return 1;
+		}
+		result = sasl_server_step(c->conn, buffer, recbytes, &out, &len);
+		if (result != SASL_OK && result != SASL_CONTINUE) {
+			write(c->fp, "auth failed", 11);
+			close(c->fp);
+			return 1;
+		}
+	}
 	return 0;
 }
 
@@ -77,7 +119,7 @@ void readQuery(kClient *c) {
 		}
 		if (c->auth_complete != 1 && auth_client(c) != 0) {
 			printf("auth failed!\n");
-            break;
+			break;
 		}
 		if(-1 == write(c->fp,"need_auth",9)) {
 			printf("write fail!\n");
@@ -113,7 +155,7 @@ int main()
 			return -1;
 		}
 
-		printf("accept ok!\r\nServer start get connect from %#x : %#x\r\n",ntohl(c_add.sin_addr.s_addr),ntohs(c_add.sin_port));
+		printf("accept ok!\nServer start get connect from %#x : %#x\n", ntohl(c_add.sin_addr.s_addr), ntohs(c_add.sin_port));
 		kClient *c = createClient(nfp);
 		readQuery(c);
 	}