The Maxianshan north-margin fault is a left-lateral reverse strike-slip fault during late Pleistocene to Holocene periods, and it primarily controls seismieity of Lanzhou city. From west to east, it can be divided into 4 segments：Wusushan, Maxianshan, Qidaoliang and Neiguanying segment. Wusushan segment is the seismogenic structure of Lanzhou M7. 0 earthquake in 1125, and the average recurrence interval of its characteristic earthquakes is 2 250 - 3 590 a. Considering only 882 years have elapsed since 1125, probability of another strong event is low during future 200 years. Average recurrence interval on Maxianshan segment is about 3 120a, and there were several moderate destructive earthquakes occurred on it in history. So we should pay attention to the potential seismic risk on this segment. The paleo-earthquake recurrences interval on Qidaoliang segment and Neiguanying segment are not obtained yet, but moderate-strong earthquakes have occurred on them in history, and will occur in future. The recurrence of earthquakes on them can make reference to Maxianshan north margin-fault＇s approximately.