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S12X series dual-core MCU with a coprocessor XGATE has the advantages such as high speed of data processing, short reaction time and low power consumption. So it has more good application prospect in the field of embedded application. In this design, the 16-bit dual-core MCU named MC9S12XEQ512 has been selected as the main processor. The CAN transceiver chip ADM3053 has been used to implement the CAN interface circuit, in which CAN transceiver, the signal isolation function and isolated DC-to-DC converter are all integrated. The paper describes the design and implement of CAN gateway having three CAN interfaces for solving the CAN network's extending and interconnection, achieving the purposes of interface miniaturization, low power consumption and low cost. The technology of dual processors in embedded system design has been also applied to optimize the performance of the gateway. The coprocessor XGATE is used to handle the miscellaneous interrupts and the main processor S12X CPU is used to analyze the protocol and exchange messages. The application results show that the gateway can work stably and reliably. Compared with the existing gateway realized by the traditional single core processor, the performance of data throughput and reliability has been improved.