There are so many signal kinds for special Network , the normal has LIN, CAN, FlexRay,TIP/C, SAEJ1850 ,TFCAN, ASRB, MOST and so on , The American Auto Engineer Association (SAE) separates the special serial signals into three classes according to the transmission speed ,there are A,B and C. Class A contains TTP/A (time Triggered Protocol/A) and LIN(Local Interconnect Net work)，the transmission speed is lower. Class B B contains J1850, VAN and low speed CAN.The class of C contains TTP/C, FlexRay and high-speed CAN(ISO11898-2). It is used in the relative parts of Auto safety or higher and more stable system ,such as Power System and so on ,the transmission speed is quicker , the normal speed is from 125Kbps to 10Mbps. FlexRay is one kind of high-speed transmission Bus (10Mbps per channel), it has the characteristic of time-sharing multiple-work and owns the functions of high and stable transmission and debug , it is very suitable for the new generation Auto control system . system .