Abstract:The physical and chemical properties of ultrafine powders of Lentinus edodes handle enzyme hy－ drolied were studied by measuring a number of physical and chemical indicators， including grain size， swelling， water holding capacity， oil holding capacity， nitrite adsorption capacity， solubility， hygroscopicity， bulk density， results show： mushrooms handle ultramicro powder average particle size of 18.5 μm； the aver－ age expansion force 13.33 mL/g， the average expansion rate of 776 %； the average water holding capacity of 2.545 g/g； the average oil holding capacity of 0.189 g/g； adsorption amount of nitrite was 0.538 mg/g； solubility was 4（25 ℃） and 3.2（100 ℃）； the moisture absorption rate of basic linear upward trend， fifth days the mois－ ture absorption rate of 22.7 %； the average bulk density（g/mL） 0.458. With the control（mushrooms handle of ordinary powder， the particle size was 80 mesh， equivalent to 175 μm） compared with the following differ－ ences： expansion force， high 5.23 mL/g， increase rate of 64.6 %， expansion rate high 582 %， increase rate of 300 %； the water holding capacity of the difference was not obvious； oil holding capacity decreased by 86.5 %； the adsorption of nitrite ability was 8 times that of ordinary powder； the solubility was far greater than the ordi－ nary powder， at room temperature（25 ℃）under the former was 2.4 times， 100 ℃ up to 8 times.