High-throughput satellite mainly provides Internet service, which has higher date transmitted rate dozens of time than the traditional communication satellites. The maximum utilization of satellite power and satellite capabilities is of great significance for improving the performance of high-throughput satellite systems. The ability to deliver power flexibly between beams throughout is key to HTS payload[1],[2].MPA(Multi-port Amplifier)is research hot spot in recent years on HTS satellite, which is a way to realize flexible payload. In This paper, a design method of Ku-band MPA based on traditional LCTWTA is introduced.