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A four-channel servo controller designing and realizing scheme for guided missiles is provided in this paper. According to high communication rate and multi-channel servo control requirements to the research task, the servo controller is designed base on 485 protocol processor of JS71175 and XC164 as main control chip, this controller improve synchronization 485 bus communication rate, meanwhile, realize for-channel servo mechanism control and lock or unlock servo mechanism action, have the characteristics of small volume, high power and high integration. The tests indicate that, under the premise of stable communication, communication rate up to 2Mbit/s, total power up to 1 600 w, and satisfies the task needs.