The superlarge Jinchang gold deposit is located in the connection between the Taipingling uplift and Laoheishan depression of the Xingkai massif in eastern Jilin and eastern Heilongjiang and the country rocks are metamorphic rocks of the Neoproterozoic Huangsong Group. In this region,the Yanshanian magmatism can be divided into 5 stages, the first three were mainly of diorite and granite and the latter two granitic porphyry and dioritic porphyrite, forming magmatic domes and cryptoexplosive breccia chimney, followed by large-scale hydrothermal alteration. Gold mineralization is closely related to the fourth and fifth phase of magmatism. Ores are mainly auriferous pyritized quartz vein, auriferous quartz-pyrite vein, auriferous metallic sulfide quartz vein, auriferous pyritized calcite vein. The age of the gold deposit is 119.40-122.53 Ma. The ore bodies are controlled by an integral tectono -magmatic hydrothermal alteration system, the metallogenic source came from the deep, and the metallogenic fluid was magmatic water with subsequent input of some atmospheric water. The metallogenic conditions were medium-high temperature, medium pressure, salinity slightly higher than the medium level, and the fluid of weak alkaline and weak reducing, that are of the K -Na -Ca2 -Cl--SO42- type. Gold was present in the fluid as complex compound, such as [Au(HS)2]- , [AuCl2]-, [Au(CO3)]- and [Au (HCO3)2]-. When the temperature and pressure lowered down and the fluid turned from acidic to weak acidic and further to weak alkaline, the complex compound cracked down and the gold precipitated.