This article introduced carries on the fuzzy controller’s design process using the VHDL language, The degree of membership function's memory used the partition memory law to the fuzzy control process, the design method has been simple, raised the operating speed and the precision. with the advantages of fuzzy control theory and the limitations which the PID control algorithm for the traditional application in the modern agriculture, meanwhile designed the fuzzy self-turning PID control algorithm, and then studied and analysis this algorithm deeply, and has given the corresponding VHDL code.