To solve the orientation disorder of flexible biomass particles in food processing and bioenergy production， a triangular groove channel was designed. Based on the computational fluid dynamics-discrete element method （CFD-DEM）， a gas-solid coupling model for flexible particle movement in a triangular grooved channel was established. Among them， the double-chain bonded sphere model was used to characterize the flexible biomass particles. Orthogonal experiments were designed to study the influence of gas velocity， particle length， channel inclination， and groove angle on the orientation of flexible particles. The results show that the proportion of flexible particles with an orientation angle of 0 to 10° is as high as 0.9； the channel inclination angle β has the greatest impact on the orderliness of particle orientation， and as the particle length increases， the channel inclination angle and groove angle decrease， but the orientation orderliness increases. In the optimized model， the proportion of particle orientation angles from 0 to 10° is 0.96， the orientation order parameter S is -1.911， and the particle orientation is generally consistent with the direction of the groove； the average velocity of particle movement is 2.467 m·s-1. This achievement provides a theoretical basis for the study of particle orientation.