The Carlin -type Au deposit in China is mainly distributed in the NW, SW margin of Yangzi plate and the Middle Hunan. And the overwhelming majority of them are intensely altered in metallogenesis. In this paper, the typical Carlin - type Au deposit metallogenetic alteration in 2 Au triangular areas of San - Gan - Chuan of NW and Dian - Qian of SW are analyzed ; the metallogenesis type and the relationship between it and the metallogenesis period, the relationship between metallogenetic alteration and structure; the geo- physical - geochemical conditions of metallogenetic alteration and genesis element ; the geochemical feature of metallogenetic alteration are summed up, which will be significant in the guide to exploration of this type of ore deposit.