In order to improve the quality of tea wind-selecting, the tea particles were approximated as spherical particles, and based on aerodynamics, the movement trajectory and horizontal drift of different weight particles under different inlet flow field (different air velocity distributions) of the tea wind-selecting air inlet, and the effect of air velocity angle on quality of tea wind-selecting are investigated through numerical calculation, being combined with experimental verification. The research showed that the effective drift spacing between particles of different weight is greater than the other air velocity distribution program, in the same wind-selecting room, and the air velocity distribution rising from the top to the bottom. The angel of air velocity direction α=16.3° and air velocity distribution coefficient β=0.17 were regarded as the most favorable air inlet flow field parameters. This study provides a theoretical basis for optimization design of tea wind-selecting machine.