Abstract: In order to realize the multi-node communication between the main control system of array antenna and the other systems based on VxWorks, a communication protocol based on UDP is used in this paper. In the application layer, a unified communication protocol is designed, which can ensure communication between both parties. At the same time, the buffer mechanism is designed to store the command and ensure that the information is not lost during the transmission, so that the order task can be executed normally and orderly. Experimental results show that the protocol and buffer queue can achieve the multi-node communication between the main control system and the other systems.