Abstract: A kind of high-speed rice transplanter’s electro-hydraulic control profiling system was designed and researched. In consideration of the lifting and neutral stages of the profiling system for high-speed rice transplanters， a pressure-position switch control method was applied in rice transplanters’ profiling system design. According to the performance requirements of rice transplanters at different stages， the models of position-feedback control at the lifting stage and power-feedback control at the neutral stage，as well as the model of power-position switch control were respectively established by using the Matlab/Simulink software platform. Moreover， in order to improve the control performance of the system， the fuzzy PID algorithm was adopted to control the system. The results showed that the fuzzy PID control can greatly promote the control performance of the system compared with the traditional PID control at different stages.

Key words: high-speed rice transplanter, profiling system, electro-hydraulic control, force- position switch, fuzzy PID