A new kind of network,PCNN model,which has been developed since the 1990s,is especially suitable for image processing.However,up to now it has only been used in the processing of gray images.In this paper,the use of PCNN in the color image is researched.Color space is divided into 3 independent components and then PCNN is used to process each component as if it were used to the gray image.Through the above method the edge infomation can be obtained,and in the end achieve the image segmentation effect.