This paper extracts 1 295 TC edges from 1 295 IR images of 69 TCs during 2006-2010,and calculates the fractal dimension of the edges using the compasses method.The 1 295 TC edge fractal dimension are sorted in descending order and classified into five categories,denoted by A,B,C,D and E,which are in the same frequencies.The fractal dimension mean value of the five categories are 1.21,1.26,1.29,1.33 and 1.40,respectively.Then we find five samples nearest to the five averages.The IR images and TBB contour map of the five samples show that the edges of TCs are more rough and non-circular,and the structures of TCs are more complicated,as the increase of the fractal dimension.All above indicate that the fractal dimension of TC edges can quantitatively describe the complex degree of TC to some extent.