Based on petrogeochemistry, the samples form intrusions in western Qinling mostly belong to high-K calc-alkalic series with a few scatter to calc-alkalic series. The results in this essay also show that there exist adakite and Himalaya type granites in the northern edge of Western Qinling, and the Jianglugou, Ayishan and Zhongchuan intrusions are similar to Himalaya type granite, and Ayishan pluton is similar to adakite based on the content of Sr and Yb. On the other hand, the adakite and Himalaya type granitoids in the northern edge of Western Qiling provide the clue to the collision of subduction between the North China Plate and the Yangtze Plate in Triassic period, which lead to the event of crust thickening, and the partial melting of thickened lower curst in different depth produced adakite or Himalaya type granite.