A design method of fuzzy control system of combine cylinder based on VHDL and FPGA was proposed. With the fuzzy logic toolbox of Matlab, the fuzzy inference rules and the algorithm architecture of cylinder were constructed. According to top-down mode, the VHDL modular design of the controller was carried out. Time simulation and function simulation of the fuzzy controller were proceeding on MAX+PLUSII, and the design was realized. The results indicate that FPGA implementation of fuzzy control about combine cylinder has many advantages, such as timing test is convenient, inference speed is high, design modification is agile, and system integration is great. It is an efficient method to implement intelligent control strategy. 