Abstract: Based on the higher speed and accuracy development of flat knitting machine control system ,we analyze the technical indexes which can satisfy the requirement of the power supply of the flat knitting machine control system，and design the scheme for high frequency switching power with the common DC bus and a multiplexed output. The design methods and parameters of a forward type circuit topology power with 24V input voltage and large output current are selective analyzed. Experiments have been carried out on a prototype, the results show that the four-way output voltage precision of the switching power is within 3%, output voltage is stable, ripple is small. It is accordance with requirements of the power supply of flat knitting machine control system and the knitting speed of knitting machine can reach 1.5m/s based on this power. It provides a cost-effective solution for the development of high-end flat knitting machine control system.