本文介绍了一种能够进行程序下载的CAN通讯调试器的设计。它既能对支持CAN下载或UART下载的T89C51CC0X芯片进行在线编程，又能对CAN总线上的节点进行通讯功能的调试。主要介绍下载器的工作原理、硬件电路设计和CAN总线的调试界面设计。-This paper introduces a procedure to carry out CAN communication download debugger design. It can to support the CAN or UART download download T89C51CC0X chip online programming, but also on the CAN bus communication nodes debug. Introduction Download the main working principle, the hardware circuit design and debugging of CAN bus interface design.