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Change regularity of physicochemical properties of corn straw, peanut shell and sawdust which are supplied from different seasons was studied based on a case study of biomass solid fuel plant in Daxing district of Beijing. The results showed that total moisture of sawdust was higher, more than 40%. Total moisture of corn straw and peanut shell was about 10%. The bulk density, flow characteristics, calorific value, ash, volatile matter of three types of raw materials were varies. Sawdust had relatively high bulk density and volatile matter but lower ash. Peanut shell and sawdust dry basis calorific value was higher than corn straw high. However, as received basis calorific value has lower. Physicochemical properties of the same materials of different season were different; especially total moisture varied with the local climatic conditions. After June, dry basis calorific value of corn straw, peanut shell and sawdust were reduced about 7%, 3.5% and 5%. Therefore, difference of physicochemical properties of several of raw materials such as bulk density, flow characteristics should be fully considered during related equipments design process of storage, transport, and compression forming of raw materials. Furthermore for the combustible characteristics of raw materials, not only difference of physicochemical properties should be considered, but also different seasons.