Including the granite stocks, a series of igneous rocks during the Mesozoic developed in Gejiu area, Yunnan province.This essay aims at the Laochang-Kafang granites stocks. Combination with the local geological settings, geological features and petrologic characteristics of the stock ,by means of geochemical testing and LA-ICP-MS, the research indicate that the figure of ACNK are over 1.0 and the content are all very high, so Laoka granite belongs to shoshonitic and HHP granite. The granite is S-type granite and experienced high differentiations and evolution. The diagram of n(Rb)/n(Sn)vs. n(Rb)/n(Ba) and (CaO)/n(Na2O)vs.n(Al2O3)/n(TiO2) all indicate Laoka granite originated from the magma formed by argillite rocks.The result of dating shows that the emplacement age is 85±0.85Ma, as the data of forming age and spatial distribution are obviously different from the late granite formed in Yanshanian in cathaysia block, a further speculate on the geo-tectonic setting of this area is it may influenced by both tethyan tectonic domain and pacific tectonic domain.