The design of the control of position transformation is a very vital part in the system design of the north seeker,so the position transformation accuracy of the transformation structure must meet the accuracy needs of FOG north seeking. Combining with the advantages of traditional PID control and fuzzy control,this paper designs the transformation controller of north seeker based on adaptive Fuzzy PID in the hardware system with FPGA as the core,which brings the advantages of traditional PID control and fuzzy control into full play.Besides, this paper establishes the system model in Matlab/simulink,which offers the basis for the fuzzy principle and the choice of primitive PID data.The experiment result shows that the accuracy of position transformation system can satisfy the demands of north seeking accuracy.