diff --git a/lib_acl/changes.txt b/lib_acl/changes.txt
index 977786afb..6de1363f8 100644
--- a/lib_acl/changes.txt
+++ b/lib_acl/changes.txt
@@ -1,5 +1,8 @@
 修改历史列表：
 
+660) 2019.8.9
+660,1) bugfix: events_kqueue.h 中时间间隔计算有误，导致时间间隔过长
+
 659) 2019.8.2
 659.1) bugfix: acl_myloc.c 中的函数 init_log_mutex() 去掉 PTHREAD_MUTEX_RECURSIVE 宏
 的条件编译，可能会造成一些未知问题
diff --git a/lib_acl/src/event/events_kqueue.h b/lib_acl/src/event/events_kqueue.h
index 5344f9bd6..f8e8add61 100644
--- a/lib_acl/src/event/events_kqueue.h
+++ b/lib_acl/src/event/events_kqueue.h
@@ -87,8 +87,8 @@ typedef struct kevent EVENT_BUFFER;
 	    tsp = 0; \
 	} else { \
 	    tsp = &ts; \
-	    ts.tv_nsec = 0; \
-	    ts.tv_sec = (delay); \
+	    ts.tv_nsec = ((delay) % 1000) * 1000000; \
+	    ts.tv_sec = (delay) / 1000; \
 	} \
 	(ev_cnt) = kevent(eh, (struct kevent *) 0, 0, (ev_buf), (buflen), (tsp)); \
 } while (0)
diff --git a/lib_acl_cpp/samples/aio/http_client/main.cpp b/lib_acl_cpp/samples/aio/http_client/main.cpp
index a9c0cec2c..234dea3d6 100644
--- a/lib_acl_cpp/samples/aio/http_client/main.cpp
+++ b/lib_acl_cpp/samples/aio/http_client/main.cpp
@@ -217,6 +217,9 @@ int main(int argc, char* argv[])
 	// ���� AIO �¼�����
 	acl::aio_handle handle(kernel_event ? acl::ENGINE_KERNEL : acl::ENGINE_POLL);
 
+	handle.set_delay_sec(0);
+	handle.set_delay_usec(1000000);
+
 	//////////////////////////////////////////////////////////////////////
 
 	// ���� DNS ������������ַ
@@ -254,12 +257,18 @@ int main(int argc, char* argv[])
 		fflush(stdout);
 	}
 
+	time_t last = time(NULL), now;
 	// ��ʼ AIO �¼�ѭ������
 	while (true) {
 		// ������� false ���ʾ���ټ�������Ҫ�˳�
 		if (!handle.check()) {
 			break;
 		}
+		(void) time(&now);
+		if (now - last > 0) {
+			printf("continue check %ld seconds...\r\n", now - last);
+		}
+		last = now;
 	}
 
 	handle.check();