Abstract: In order to evaluate edible quality ofcommercial mushrooms in Alar, the contents of protein, amino acid, vitamin C, reducing sugar, ash and moisture were determined in sporocarp of Pleurotus eryngii, Leurotus ostreatus, Zhenji lyophyllum, Agaricus bisporus, Flammulina velutipes and Lentinula edodes.The results showed that the contents of crude protein were all above 22%, among which Agaricus bisporus washighly to 49.20%.The six edible mushroomswere rich in 17 kinds of amino acids that were higher than 12%. The content of essential amino acidsin Leurotus ostreatus accounted for the hightest 7.84%.Compared with the FAO/WHO model, the protein of six commercial mushrooms were close to the ideal protein. The edible quality of Lentinula edodes isthe best estimated by amino acid score ( AAS) . The essential amino acid proportion by the ratio coefficient ( RC) of six edible mushrooms showed that leucine was excess and isoleucine and valine were not enough in Lentinula edodes.The content of vitamin C were higher than 3.3 mg/100 g and content of reducing sugarwere higher than 0.21%. The contents of inorganic salts of six edible mushrooms were similar, among which the best content of Agaricus bisporus' ash was1.50%. Letinous edodes' moisture content was the best, for 14.71%.It was found that the edible mushrooms in Alar was rich in nutrients.