On the basis of sulfide phase equilibria of the systems Ag2S-PbS，Ag2S-PbS-Sb2S3 and Ag2S-PbS-Bi2S3.and electron microprobe analyses of galena from various mineral assemblages in some deposits of Inner Mongolia，the authors discuss the occurrence state of silver and its enrichment pattern in galena in relation to Sb and/or Bi contents. In Sb-bearing geochemical environments and under low temperature conditions (<350`C)，silver tends to form fine-grained,independent Ag-Sb-sulfosalt minerals in galena which m uch favors the recovery of silver in the course of ore-processing. In Bi-bearing geoche mical environ m ents and under low temperature conditions，however，silver tends to be disseminated in galena as an isomorphous substitute for Pb, which renders its recovery from the ore difficult or even impossible. In the Baiyinno deposit where native bismuth and Bi-sulfosalts were formed under hydrothermal conditions，silver exists independent sulfosalts in the galena matrix and as an isomorphous substitute for Pb in galena. The recovery of silver in these deposits is therefore low. Electron microprobe analysis of galena from these deposits indicate low silver content of galena coexisting with Sb-sulfosalts but high silver content of galena coexisting with native bismuth and Bi-sulfosalts.