Abstract: Biomass grinder is a biomass straw crushed high-speed machine.Flat two-dimensional graph was used for traditional design approach，its disadvantages was not intuitive and inconvenient modification.Three-dimensional model design of key components of efficient biomass straw grinder was designed based on ProE.Physical properties and interference detection of model was analyzed.According to results of the analysis，assembly effects and structure of rationality were ensured and design scheme was amended.Application of this design can improve efficiency，and be shorter development cycles.