Abstract: The principles of fractal geometry and method of box-counting dimension have been used to calculate the fractal dimension value D of fault systems in three oil-gas prospecting areas (Qiangtang, Biru, Cuoqin) and an ore-deposit prospecting area (Sanjiang) in the Tibet region. The values were then compared with those of the oil-gas area in Sichuan, ore-deposit areas in Dexin, Jiangxi province and in central Hunan province respectively. It has been found that the dimension of fault systems in the oil-gas hearing areas is l 1.80, larger than that of the whole region. The larger the dimension, the larger the scale of ore-deposit. The results of this study suggest that it is hopeful to find certain oil-gas fields in the Qiaiagtang and Biru prospecting areas, and high-grade ore-deposit in the Sanjiang prospecting area.