The paper is aimed to present its authors' study and finding of the optimum conditions for Cd2+ biosorption property,for which purpose we have conducted a test by using the waste left-over part of Flammulina velutipes as a biosorbent.As a result of our study,we have found that there are 5 main factors that affect the adsorption capacity of F.velutipes,that is,the sample treating methods,pH value of solution,shaking time,initial concentration of metal ion and the dosage of mycelium used.The results of our st...