As the main method to improve city-bus service level, CBIICS (city-bus information integrated control system) contains three technical aspects, i.e., city-bus electronic control technology, vehicular network technology and intelligent control technology. In this paper, we firstly defined the conception of CBIICS including definition, object, characteristic, function and target. According to vehicular network protocol and system function, we secondly designed CBIICS framework with two typical vehicular network protocols - CAN and FlexRay, four buses - CAN_L, CAN_H, CAN_R and FlexRay. CAN_L/CAN_H bridge acts as intelligent bridge between CAN_L bus and CAN_H bus. Thirdly, we mainly designed intelligent bridge based on LPC2194. For performing the functions of intelligent bridge, fourthly, we designed software method to achieve the target of data filter and transfer and control strategy. Finally, we discussed the research trend of CBIICS and intelligent bridge