This paper analyses the generating mechanism of China Companies' mineral resources-obtaining international strategic alliances (MROISA) performance from the perspective of value creation, and builds an evaluation index system of China Companies' MROISA performance from two aspects of the expected performance and non-expected performance. Based on the evaluation index system, this paper points out that the improving tactics of China Companies' MROISA expected performance are to strengthen the qualities and quantities of mineral resources inputted by alliance partners, reduce the risks from politics, culture, information, technology, funds and management, decrease the costs in system, facilities construction, exploration and development, environmental protection and transport; the improving tactics of non-expected performance are to accelerate inventory turnover and current assets turnover, raise mineral resources utilization rate and product qualification rate, increase market share and enhance market power.