For the safety of radiation protection for people who work in radioactive environment, the y dose-rate needs be measured. The remote measurement system is developed based on RS-485 bus and optical fiber communication project. The system has better anti~ interference ability and high reliability. Win API functions are used in the measurement and control program. Serial communication efficiency is improved by multithreading technique and custom messages response system. The calibration and field running results indicate that the error of the system is under 10% during 0 to 1004mGy/h. And this system is reliable and satisfactory.%为保证放射性场所工作人员的辐射防护安全,需要对γ剂量率进行远程监测；根据要求,研制了监测系统,采用基于RS-485总线方式的分布式采集、光纤通信的设计方案,提高了系统的抗干扰能力和工作可靠性；采集与控制软件的串口通信功能采用Win API函数,基于多线程技术和自定义消息响应机制开发,通信效率高；经检定及现场应用,表明系统在0～1004mGy/h范围内误差低于10％,且整体运行良好,稳定可靠,获得了良好的效果.
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