The extraction process of fractal graph m materials fields has been studied. The flow of exlracting fractal graph from origmal photo is given in this paper. Fractal Dimension Calculation Program (FDCP)has been designed with Visual C++programming language. Inter-face's fraclals have been extracted from Mo/β'-Sialon and Ta/S'-Sialon FGMs' SEM pho-tographs. And the dimensions have also been calculated by FDCP. There is diffusion in sintering process of Mo/β'-Sialon ant Ta/β'-Sialon FGMs and the sintering proce...