Abstract: Green banana powder with different particle sizes were taken as the research object.The powder characteristics were analyzed,such as the fillibity,repose angle and slip angle.The effect of different particle sizes of green banana powder on tablets by direct compression method was investigated.The results showed that the size distribution of 90.07% green banana powder ranged from 140 to 220 mesh.When mesh number of the powder increased,the tap density and bulk density reduced,the repose angle and compressibility increased.It reflected that fillibity and fluidity of the powder were worse.In addition,the hardness of green banana powder tablet increases with the mesh number increasing,the hardness of tablets had no significant difference (p>0.05) when mesh number of the powder was over 180 mesh.The disintegration time of tablet was shortest when it was 160 to 180 mesh. The green banana powder should not be more than 180 mesh when it was applied to tablet preparation. The conclusion provides basic data for the development of green banana tablet products.