Abstract: Microwave drying is an advanced drying technique，in which thermal energy is generated inside the material by electromagnetic energy radiation and hence moisture is intensively evaporated toward the material surface. But heating non-uniformity is an inherent problem to microwave drying. In this paper，the factors relating to microwave heating non-uniformity were analyzed，and then feasible approaches to microwave heating uniformity were outlined by improving the uniformity of electromagnetic field distribution and moving the materials to be processed. At last，R & D trends of microwave drying with heating uniformity were pointed out and discussed.