The variable frequency constant pressure water supply device has been widely used in the new type ship. In order to develop an embedded control system with independent intellectual property rights, a rapid development method-model based design(MBD)for embedded control system of variable frequency and constant pressure water supply unit is proposed in this paper. Firstly, a mathematical model consistent with the characteristics of real frequency conversion unit is established through experimental identification. Secondly, under the unified simulation environment of Simulink, the fuzzy self-adaptive PID voltage regulator and the switching logic controller based on Stateflow finite state condition were developed according to the model design, and the dynamic control simulation experiment was carried out by combining the two. Thirdly, the embedded control C code was automatically generated using Embedded Coder,and the embedded control system was integrated and deployed into the embedded control board based on STM32 to realize the rapid development of embedded control system. Finally the effectiveness and convenience of the embedded control design and development using this method are verified through the actual device operation experiment.