Abstract: In order to overcome shortcomings of the traditional PID controller for nuclear steam generator water level, the paper designs a fuzzy control system for steam generator water level using fuzzy reasoning and digital signal processor (DSP) technology. By summing up the experience of skilled operators, it gave a set of fuzzy control rules, and determined some important control parameters. Considering the real-time control, and system stability, it also designed a fuzzy control system using DSP. Simulation results show that the system has good performance.