With automatic feeding sorting workstation as the research object，the working principle of it was analyzed. The work flow chart and work cycle synchronization diagram of three different control schemes were put forward on applying the related theory of automatic cycle diagram, and their control programs of programmable logical controller (PLC)were designed with the signal flow chart (SFC).Theoretical research and experimental results show that the third control scheme reduces the takt time between each actuator, and improves the productivity of feeding sorting.