Abstract: Aiming at the weakness of poor contrast and the background area variance of retinal image，a method for retinal image vessel segmentation based on KFCM is presented.Firstly，the two-dimensional Gaussian matched filter is used to enhance the retinal image.Then based on kernel fuzzy C-means the enhanced retina image is segmented，according to relations between retinal vein image and the different clustering degree of membership merge clustering images automatically.Finally，the vessel image is obtained.The simulation results show that the performance of this method is satisfied.