Intellectual Property (IP) reuse improves System-on-a-Chip (SOC) design productivity, and helps to meet design quality and time-to-marks goals. In this paper, we present an approach to that we successfully adopted in reusing the CAN bus controller IP core. To describe our approach, a MCU design SHU-MV10 is performed. The CAN bus controller IP core is inherited from the stand-alone controller SHU-MVCAN with few modifications, and is used in the design of MCU SHU-MV10 successfully by adding bridge module. This reusable design method is not only cuts down the design time but also ensure the accuracy.