Abstract: Beam steering system serves as the nerve center of high power phased array antenna, and it is responsible for the precise phase control and status monitoring of all element in antenna array. To achieve fast and accurate beam steering conversion, two level distributed beam steering scheme is designed using distributed topology and embedded real-time operating system VxWorks, and beam steering host system of phased array antenna based on VxWorks is developed. Multi-node network communication between beam steering host system and other systems is achieved via UDP protocol, and VxWorks multitask programming interface is utilized to design a Socket communication method based on the buffering queue to meet the high-speed and real-time communication demands, and a custom application layer protocol is designed for parties to accurately interpret communications. Feasibility of the scheme and reliability and stability of the control software have been verified through developing and applying the phased array antenna beam steering host system based on VxWorks.