The beam steering system is an important subsystem for phased array antennas. The functions of phased array antennas such as beam steering,agility and shaping are accomplished by beam steering system. In traditional way, beam steering system are composed by beam steering crate and units. In order to achieve a high-integrated, high-speed and simplify cable layout system suiting airborne phased array radar, a beam steering system based on Serializer/Deserializer (SerDes) is presented on this article. The modules of system are integrated in antenna to reduce the weight and volume using 2Gbps SerDes as the transmit bus which can simplify the cable connection. The design of system and modules, timing synchronization and high-speed data link are analyzed. The typical performance of the antenna is tested, which validates the design idea.