Abstract: A new intelligent controller for low-voltage breaker based on TMS320LF2407A DSP was(introduced) in the paper,and the design and development of monitoring and control system for the upper computer based on intelligent CAN interface card were presented.The design of hardware and software of the monitoring and control system were expounded.The design of hardware and software of CAN communication model of the intelligent controller,the monitorinig software of the upper computer were also(introduced.) The results of industrial tests showed that the controller has high reliability.It can be widely applied.