Abstract: Objective In this paper,the membership function in fuzzy logic is applied to image segmentation.It u-ses the value of a membership function within a certain range instead of a segmentation threshold todetermine which category apixel belongs to.This method is called the fuzzy logic image segmentationmethod(FLIS).Through image segmentation experiments with real aerial images,we compare exper-imental results with existing methods.The results show that the FLIS method has clear advantages.