Chemical properties of spray-dried powders separated based on molecular weight from crude protein binding polysaccharide (CP-SD) of Agraricus blazei were examined. Contents of ${eta}$-glucan in SD-1, SD-2 and SD-3 were 18.67%, 48.24%, and 37.15% respectively, and SD-2 (10-150 kDa) showed the highest molecular weight. Obtained ${eta}$-glucans were not pure glucan, but was determined to be an acidic proteo-heteroglycan with a large amount of glucose (74.46-80.05%), galactose (8.91-15.2%), and mannose (4.9-5.46%). Composition of their amino acids was mainly aspartic and glutamic acids. FT-IR spectrum revealed SD-1, SD-2 and SD-3 were structures of ${eta}$-1,3-glucans and ${alpha}$-1,6-glucans at 890 and 930 $cm^{-1}$, respectively, signals of ${alpha}$-1,6-glucans for CP-SD was not found. Useful CP-SD was recovered from A. blazei for preparation of three powder types as food materials.