Allium mongolicum Regel must be made into powder so as to be used widely in the food industry， and the quality of Allium mongolicum Regel powder determines the application range of Allium mongolicum Regel. In this paper， the methods of vacuum freeze drying (FD)， vacuum drying (VD) and hot air drying (HAD) were used to dry Allium mongolicum Regel， and the dried Allium mongolicum Regel were ground to obtain Allium mongolicum Regel powder， and the quality characteristics of Allium mongolicum Regel powder with different particle sizes were further explored. The results showed that the drying method had significant effects on the yield， rehydration， bulk density， fluidity and color of Allium mongolicum Regel powder (P<0.05). FD powder has the smallest average particle size (30 μm)， the largest bulk density (1.57 g/mL)， the highest brightness (56) and the highest angle of repose (47.77°). The micromorphological distribution of HAD and VD Allium mongolicum Regel powder is uniform， composed of round， oval and other particle shapes， and the particles are more dispersed. The micromorphology of FD Allium mongolicum Regel powder is composed of flakes， chips and other particle shapes， and the particles are more aggregated with higher bulk density. The other characteristics of FD Allium mongolicum Regel powder is highest yield (50%) when bigger particle (50 mesh) is obtained.