Abstract: Heating nonuniformity and low utilization efficiency of microwave energy are bottleneck problems that constraining large-scale applications of microwave technology in food production. In this paper,a strategy that setting semicylindrical convex groove in the inner wall of the microwave reactor is proposed.The influence of convex groove parameters on the heating efficiency and uniformity of the microwave reactor is simulated by using the finite element method.The simulating resultsareanalyzed and discussed.The results show: ①the convex groove structure can effectively improve heating efficiency and uniformity of microwave reactor;②there are a series of laws between heating efficiency and uniformity;③heating efficiency and uniformityof microwave reactor can reach to 98.53% and 54.12%,respectively.