Abstract: Yantonglazi deposit is one of the newly discovered Ni-Cu-PGE sulfide deposits in eastern Jilin province,and its characteristics are seldom mentioned at home and abroad.We analyzed geological features,mineralogy,chalcography,and electron probe of Yantonglazi PGE-Cu deposit,the results indicate that ① the orebody occurs mainly in the inner contact belt between gabbro and the epi-metamorphic rock of Wudaogou group;and ②the wall rock is the garnetized gabbro formed by hydrothermal metasomatism.This article comes to a conclusion that the hydrothermal metasomatism is a crucial factor for metallization.