Abstract: To achieve miniaturized beam steering system for phased array antenna, a Controller Area Network (CAN) controller IP core based on Avalon bus was designed. Function structure of the IP core was given based on CAN2.0B protocol specification, and designs of controller interface logic, bit stream processor, bit timing logic and so on were completed using Verilog HDL language, and its hardware driver and communication software were developed. The reusability of the IP core was demonstrated with the designed SoPC system which integrated the CAN controller IP core, Nios II microprocessor, phase controller IP core and so on. The experimental results show that the system can realize data communication in the actual network reliably and stably. The built-up system based on this module has many of advantages, such as easy expansion, high portability and broad applicability. The IP core can also be used in high-density and compact industrial control equipments.