Abstract: Several important emplacement mechanisms are described.Based on this, a comprehensive analysis on emplacement mechanism types of Xinshan granite in Yunnan Gejiu is carried out from aspects of wall rock alteration, fluid movement, and fracture control, combining with the field work and practice.The paper holds that the emplacement mechanism types of Xinshan granite belong to Magma arch effect, and the deposits which are formed in Xinshan ore section are mainly the contact zone copper and tin polymetallic deposit, the vein copper and tin skarn sulfide deposit, and the metavolcanite copper deposit.

Key words: Granite, Emplacement mechanism, Wall rock alteration, Xinshan granite body