Abstract: Erdaokan Silver Deposit is the first independent silver deposit found in Duobaoshan high ore concentration area,Heilongjiang Province.Mineralography study and electronic probe test find that the main silver minerals in the  deposit are pyrargyrite,stephanite and argentite,other silver-bearing minerals include galena,pyrite,sphalerite,coronadite and pyrolusite.The silver occurrence state is mainly independent silver minerals,followed by submicrosco-pic inclusion,isomorphism and ionic adsorption.The occurrence type of independent silver minerals includes inclusion silver,intergranular silver and fissure gold.Deposit genesis research shows that the hydrothermal stage is the main metallogenic stage and supergene stage bears the potential for secondary enrichment;stageⅠis the main metallogenic stage in hydrothermal fluids stage.The deposit is preliminarily considered to be a hypabyssal low temperature hydrothermal deposit.