According to the mechanical and electrical structure of intercooler control system, this paper expounds the working principle of intercooler heat exchange and the necessity of Fieldbus design. Combined with the hardware characteristics and drive characteristics of the intercooling control system, the controller module including basic functions, auxiliary functions and additional functions is completed according to its application situation. According to the design scheme, with the industrial PLC as the center, and with the help of environmental control system and PROFIBUS DP industrial field bus, the control of the central measurement and control system can be extended to every corner of the engine laboratory. The hardware architecture of intercooler controller based on DSP and PROFIBUS DP communication function is designed. Results the controller can not only control the air temperature after turbocharging, but also provide feasibility for industrial control interconnection and remote control. At the same time, it provides solutions for the design of other intelligent controllers in the engine laboratory environment control system.