Abstract: The mechanism，evolution of centrifugal pellet dryer and the wide application in drying polymer pellet in granulation are reviewed. Two typical dryer structures，the Gala model and Carter Day model are compared. The industrial dryer incorporates two functions of dewatering and drying in one machine exhibiting compactness，short drying period and high output. Power consumption is low and operation is simple and continuous. However，there are no quantitative relations of output and drying index with structure size and operational variables. Thus，theoretical research is urgent for choosing appropriate type and size of dryer and developing more effective machines for wider engineering use.