The paper introduces Proteus virtual development techniques into the design of the heat treatment process parameter control system, and takes each heat treatment furnace controller unit for example to explain Proteus simulation circuit of hardware and software design methods. And finally, we achieve the soft parallel hardware co-development of the microcontroller system, which can effectively save hardware resources and improve the development efficiency. Simulation results and theoretical analysis prove the correctness and the accuracy of Proteus virtual simulation, having very important significance in the microcontroller virtual development.