Objectives：Nagengkangqieergou silver deposit，situated in the eastern section of Eastern Kunlun orogenic belt and to the north of Kunzhong Fault，is a largescale structurallycontrolled hydrothermal veintype deposit，newly discovered in Qinghai Province in recent years. The characteristics of silver minerals and the precipitation mechanism of oreforming elements of Nagengkangqieergou silver deposit has been first studied in this paper.Methods：Mineragraphy observation，scanning electron microscopyenergy dispersive spectrometry analysis，electron microprobe analysis，and microthermometry of fluid inclusions trapped in quartz were carried out to investigate the characteristics of silver minerals of Nagengkangqieergou silver deposit and precipitation mechanism of oreforming elements.Results：It is preliminarily ascertained that silver minerals，occurred in Elashan Formation，include native silver，acanthite，proustite，pyrostilpnite，miargyrite，argentian tetrahedrite，freibergite，andorite，diaphorite，teremkovite，all of which contain high content of I. By contrast，silver minerals，hosted in Jinshuikou Group，are principally composed of native silver and argentite，both of which are spatially connected closely with arsenopyrite，sphalerite，stannite and contain scarcely any I. Besides，homogenizaion temperature of quartz fluid inclusions occurred in the Jinshuikou Group are clustered in the interval of 275~295 ℃，while in the interval of 155~215 ℃ for those occurred in Elashan Formation. Moreover，there is slight difference in the salinity of oreforming fluid for both strata. Oreforming fluid salinity values are clustered in the interval of 4.5~6.5% for the Jinshuikou Group，while in the interval of 5.5~6.5% for the Elashan Formation.Conclusions：Precipitation mechanism of oreforming elements in the Jinshoukou Group and that in the Elashan Formation are remarkably different，indicated by the significant difference of wall rock alteration，category and chemical composition of silver minerals as well as the oreforming fluid temperature. Therefore，this study provides guiding significance for oreprospecting in both strata.