In this paper,according to the 1:50 000 geological mapping information in east segment of the northern Qilianshan active fault zone,authors systematically analysed the geometry,inhomo-geneity features of the displacement distribution,slip rates,palaeoearthquakes and historical earthquakes in time and space along the fault zone,then summarized the rupture segmentation,It is considered that the east segment of the active fault zone can be devided into Laohushan and Maomaoshan-Jinqianghe first class rupture segments.The Laohushan fault can be devided into east and west segments,the Maomaoshan-Jinqianghe fault can devided into the Maomaoshan and Jinqianghe second class segments.