Abstract: The 10 faults along the Lanzhou-Chengdu oil pipelineare researched with geological, physiognomy analysis and investigation on site. It is found out that These faults' situation, the last active time, movement characteristics and the relation with pipeline. In according with seismic research and forecast theory, it is estimated that the width of active fault, sudden displacement, possible maximum seismic grade in the future 100 years.