Comparative studies of some silver polymetallic deposits (Caijiaying, Xiasai, Lamo, Mount Isa and Langdal) with different genetic types show that they have almost the same ore mineral assemblages such as pyrite+pyrrhotite+galena+Fe-rich and Fe_poor sphalerite+chalcopyrite+arsenopyrite+silver sulphosalt minerals of the tetrahedrite group, and the formation of the main silver-bearing tetrahedrite and freibergite is often later than that of the main ore minerals. Therefore, it may be considered that the silver sulphosalts have not an indicating significance with regard to genetic types of these ore deposits, but reveal the similarity of the ore_forming solution and the ore-forming evolution of the ore deposits. Investigation of silver minerals in these ore deposits shows that the silver-bearing tetrahedrite and freibergite are among the most important or main industrial silver minerals. It must be pointed out that the silverbearing tetrahedrite and freibergite of the Caijiaying deposit have about the same iron and zinc content, but differ from the Fe_rich and Zn-poor tetrahedrite and freibergite in the Xiasai,Lamo, Mount Isa and Langdal deposits. Moreover, copper and silver in silver sulphosalts of the tetrahedrite group show negative correlation, and their high or low silver content bears no relation to (Fe+Zn) at atomic proportion and Sb/(Sb+As) ratio. However, for the silver sulphosalts of the majority of Cu-Ag-Sb series, As/(As+Sb) ratios are exclusively lower than 0.1, suggesting that these minerals are characterized by richness of Sb and impoverishment of As. Identification of the mode of occurrence of silver in these ore deposits provides an important basis for economic evaluation of the deposits and the flotation of silver minerals in ores.