diff --git a/c/tools/log/log.c b/c/tools/log/log.c
index 5f6ec6a..3b9fc09 100644
--- a/c/tools/log/log.c
+++ b/c/tools/log/log.c
@@ -95,16 +95,15 @@ int cleanup(log_manager *self)
     loc = self->log;
     self->log = NULL;
     self->count = 0;//摘取log链
-
     sem_post(&self->log_sem);
     //释放信号量
-    
     char *logbuf;
     void *logbufbk;
     char failback[MAX_LOG_LENGTH];
     logbuf = (char*)malloc(1);
     logbuf[0] = '\0';
     size_t buf_length,buf_lengthbk = 0;
+    int fd;
     while(loc->next !=NULL)
     {
         tobeclean = loc;
@@ -114,6 +113,12 @@ int cleanup(log_manager *self)
             logbuf = (char*)realloc(logbuf,strlen(logbuf)+strlen(tobeclean->log)+1);//为日志分配新的内存
         }
         if(logbuf == NULL){
+            fd = open("log.txt",O_CREAT | O_WRONLY | O_APPEND, 0644);
+            if(fd != -1)
+            {
+                write(fd,logbufbk,buf_length);
+                close(fd);
+            }
             free(logbufbk);
             logbuf = failback;//降级策略，堆空间不足时，使用预分配栈空间，保留最后一条日志
         }
@@ -128,14 +133,6 @@ int cleanup(log_manager *self)
         }
         free(tobeclean);
     }
-    int fd = open("log.txt",O_CREAT | O_WRONLY | O_APPEND, 0644);
-    if(fd == -1){
-        perror("file:");
-        free(loc);
-        if(logbuf != failback)
-            free(logbuf);
-        return -1;
-    }
     if(logbuf != failback){
         logbufbk = logbuf; 
         logbuf = (char*)realloc(logbuf,strlen(logbuf)+strlen(loc->log)+2);
@@ -163,6 +160,14 @@ int cleanup(log_manager *self)
         logbuf[buf_length] = '\0';
     }
     free(loc);
+
+    fd = open("log.txt",O_CREAT | O_WRONLY | O_APPEND, 0644);
+    if(fd == -1){
+        perror("file:");
+        if(logbuf != failback)
+            free(logbuf);
+        return -1;
+    }
     int error_buf = write(fd,logbuf,strlen(logbuf));
     if(error_buf==-1){
         close(fd);
@@ -174,7 +179,7 @@ int cleanup(log_manager *self)
         write(fd,"unknown error case log write cut down\n",38);
     if(logbuf != failback)
         free(logbuf);
-    close(fd); 
+    close(fd);
     return 0; 
 }