The electrical scanning characteristics of phased array antennas have such as flexible scanning, precise pointing, high reliability and strong anti-interference ability point, efficient beam control system plays a crucial role in it. A low earth orbit satellite phased array antenna beam control system based on System on Chip (SoC) architecture is designed. The system uses SoC chip. On the basis, the hardware design and software design of the system are completed and verified through simulation tests. The characteristics of SoC processors is fully utilized by the system, the accuracy and real-time performance of the beam control system are improved, and the effectiveness and practicality of the phased array antenna beam control system based on a certain system platform are verified.