A personal computer-based simulation-and-control-integrated platform for the 10-MW high-temperature gas-cooled reactor (HTR-10), HTRSIMU, has been developed by the Institute of Nuclear Energy Technology (INET) of Tsinghua University in China to meet the requirements of safety analysis, operator training, and control system design. The HTRSIMU runs on a personal computer Windows2000 operating system and consists of three parts: simulation computing system (SCS), man/machine interface (MMI) system, and control system design platform (CDP). Simulation models and equations of the SCS are given, including models of the reactor core, the fuel ball, the primary loop, and the steam generator. Furthermore, functions and characteristics of the MMI and CDP are also described in detail. Moreover, steady state, several typical accidents, and a power control process of HTR-10 are simulated by using the HTRSIMU to demonstrate its simulation and control system design capability.