The interactive segmentation techniques attract more and more attention in that these techniques can handle complicated images. In this paper, an interactive image segmentation method is proposed based on proxy model. The proxy is a task-specific module which carries out certain function. Communications between an operator and computer is realized by means of the control interface and the report interface of proxy. The proposed proxy is constructed on the basis of region features of a to-be-segmented region in an image. This method is applied to solve the segmentation problem in medical images and the result shows that this method is effective in such complicated image as medical image.