Abstract: Euler-Lagrange method is adopted to study the flow and distribution characteristics of the filamentous biomass particles in the fluidized riser. According to the structural characteristics of filamentous biomass particles,a chain bendable three-dimensional particle model is established,and the effects of superficial gas velocity（5.71,6.89,7.85 and 9.10 m/s）,particles mass flow（0.018,0.0216,0.0259,0.0311 kg/s）on the axial and radial distribution characteristics of particles were investigated. The results indicate that the filamentous biomass particles exhibit a distribution law of dense lower and upper sparse in the axial direction of the riser,and the particle distribution changes from a non-uniform inverted C-shaped to an ω distribution with the increasing height in the radial direction.When the superficial gas velocity ug= 9.10 m/s,the filamentous biomass particles stay in a fast fluidization state. The interaction between the gas and solid is enhanced,and well mixed. Additionally,the filamentous biomass particles are evenly distributed along the axial direction of the fluidized riser. With the increase of the mass flow rate of particles,the aggregated area of filamentous biomass particles extends upward. The volume fraction of particles increases along the radial direction as well,and the distribution characteristics of each horizontal cross-sections have slight difference along the axial direction.