This paper analyzes models of measuring system, control and protection system, system equipments, equipment failure, and some auxiliary system in CHASHIMA NPP. Program module PROSYS for dynamic simulation of the control and protection system is developed by C language and applied in engineering simulator to dynamically simulate the control and protection system of CHASHIMA NPP. The simulator has been used for NPP safety analysis and to provide support and validation service for the design of advanced main control room. Results show that this simulation software can successfully simulate the control and protection function of primary and secondary loops in NPP.