Abstract: This paper discussed the working principle of the flat knitting machine and the operational requirements of each component during knitting.A 32-bit ARM microprocessor and groups of MCU were suggested as the main control unit and hypotaxis control respectively,and the coordinated working of them were effected by the parallel data bus and address bus,thereby realizing fully automatic control of the knitting machine.The key technologies of the auto knitting machine control system under development were presented.