Abstract: In order to realize the inspection of DIE welding voids in an uneven image background and etract small voids exactly, this paper presents two kinds of inspection methods which seperately use the 2-EEMD (two dimensional ensemble empirical mode decompositon) algorithm and the gray-scale morphology algorithm. A high power triode's DIE voids inspection is put forward for the qualification of the presented inspection methods. The results demostrate that the two inspection methods suceessfully extract the feature of the DIE welding voids in an uneven image background. The 2-EEMD welding voids inspection method is more suited to small voids inspection in nearly free-noise in Xray image, and the gray-scale morphology inspection method is more suited in various situation and real-time applications.