Abstract: The aim of this paper is to propose a quantitative analysis of the texture, including density, size, shape and spatial distribution, of the biotite in Gucret granite by thin section study Results are inferred by means of basic principles of morphological mathematics, image analysis, and stereological methods. According to the gray scale characteristics of the biotite in thin sections, their gray images can be obtained by using a direct micro photo-charting. Then, the method of an automatic thresbolding used to extract the particles of the biotite in order to form binary images. The parameters, e.g. the area and perimeter for the biotite particles, can be estimated in the binary image with the help of MIPS system. The analyses of the denity, size, shape and spatial distribution for biotite particle show an anisotropic characteristics in the granite Meanwhile, Weibul, Normal and Poisson models can describe the distributions of size, shape and the spatial distribution respectively.