Abstract: For using machine vision technology to detect textile image,segmentation way of textile image is researched.By the minimum risk Bayes decision theory,this paper develops a new way of image segmentation: establish the mathematics model of image segmentation;estimate the probability density of grey scales and figure out its math-expectation and square difference that accord with normal distribution and the loss function;and judge the every pixel dot in the image according to the minimum risk Bayes decision theory and determine whether it is of target or non-target images,thereby realizing the extraction of the target image.The experimental results indicate that the method is efficient and practicable.