The present status of instrumentation and control (I&C) as well as automation used in nuclear power plant (NPP) in the world was surveyed in this paper. The drawbacks and deficiency resulting from the analog I&C used in the conventional NPP were described. Finally the characteristics of the modern computerized I&C and advanced main control room, and the requirements on the development of the hardware and software of computerized I&C were dissertated intensively.%阐述了当今世界压水堆核电站(PWR)仪表与控制及自动化设备的发展概况；描述了模拟仪表与控制所存在的缺陷和问题；重点论述了当代先进核电站数字化仪表控制、保护系统与先进主控制室的性能和对计算机化仪表控制提出的要求。
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