Based on the age and geochemical studies about gabbro in Kayakedengtage of east Kunlun in Qinghai province, the gabbro shows the characteristics of enriched magnesium. The results show that the source originated from of mantle. However, the δCe belongs to 0.87～1.00, the rich Ce shows negative abnormity, they show the gabbro belong to the place of the joining part of the crust and the enriched mantle. Combined with the basalt tectonic discrimination diagrams, the tectonic environment of the gabbro belongs to the later orogenic belt outspread of Caledonian of Qimantage.oft-com:office:office" />