Oat was digested into different DE values by using amylase and spray-dried to powder. The powder was evaluated in properties of packing density, repose angle, caking rate and sensory evaluation. The results showed that the powder with DE values rates above 36.2 had good dissolubility and taste, but less viscosity. At last, DE values of 35～38 was supposed as the suitable amylolytic degree for obtaining the best overall quality of spray-dried oat powder.