The theory of Small Rock Mass Forming Deposit is summarized by Mr. Tang, Academician of the Chinese Academy of Engineering, in 1990s. It was focused on magmatic sulfide deposit at the beginning of release. The authors analyzed the features of some middle and large scale magmatic deposit in east Gansu Province, among which Ganshaebo porphyry mass in north Qilian and Hamardaba rock mass in middle Qilian were selected to compare with metallogenic types, process and model of Small Rock Forming Deposit.