The author have measured the relief length and height of fault planes of compressive, tensile and shear origins in northern Tarim, Xinjiang, and determined the fractal dimension D values using the formula established by Xie Heping and W. G. Parisean (1994) and then calculated the joint roughness coefficent (J.RC) values of different fracture structure planes according to the D values. It is found that the D and JRC values of compressive, shear and tensile faults are notably different and that the D values obtained by the authors are somewhat similar to those of the San Andrees fault in the United States.