与现有的其他各种对时方法相比,网络对时具有简单、经济、高效的优点。文中从改造计算机系统时钟、获取即时时间偏差、计算时钟频率漂移、软件实现技巧4个方面出发,给出了一个高效的主要基于网络时间协议(NTP)的时钟同步软件设计和实现过程。在某110kV变电站自动化系统厂内局域网和因特网上的试验表明,该软件能达到较高的对时精度。 Compared with other existing methods of timing, the network has the advantages of simple, economical and efficient. In this paper, an efficient clock synchronization software design and implementation process based on Network Time Protocol (NTP) is presented in this paper from the aspects of computer system clock modification, instantaneous time deviation acquisition, clock frequency drift calculation and software implementation skills. Experiments on a local area network and an Internet in a 110kV substation automation system show that the software can achieve high timing accuracy.