HollySys provides a virtual DCS platform that works with HOLLiAS-N to realise full-scope simulation of the nuclear power plant. It uses a virtual machine to simulate functions of all DCS control stations and operating stations, and is able to directly use configuration documents of the simulated system. The virtual DCS system platform can achieve teaching control functions such as the initial condition (IC) import, pause, rewind, accelerate, and decelerate, which are peculiar to the FSS system