Abstract: The blastability of ore rock has an important influence on the cost and efficiency of mine blasting mining. In order to comprehensively and accurately analyze the blastability of ore and rock，the in⁃ dex system of blastability of ore and rock including four indexes such as rock density and rock brittleness co⁃ efficient and the classification standard of I~VII grade of blastability of ore and rock are constructed. The in⁃ terval analytic hierarchy process is used to calculate the weight of the blastability index of the ore rock，and the interval approximation analysis model is improved to characterize and analyze the blastability index of the rock mass closer to the actual interval number，so as to determine the comprehensive grade of the blastability of the ore rock and the grade of each index. The model is used to comprehensively analyze the rock blastabili⁃ ty of multiple stopes in a phosphate mine. The rock blastability of three stopes in eight stopes is Grade IV， and the rock blastability of other stopes is Grade V. The analysis results of the rock blastability index of each stope are obtained. Based on this，the blasting scheme and parameters of the mine stope are improved，the ore removal efficiency and the qualified rate of ore block are improved，and the unit consumption of blasting explosives and blasting cost are reduced. The example proves that the improved interval approximation analy⁃ sis can make a comprehensive and scientific analysis of the blastability of ore and rock，and the results mod⁃ el can guide the design of mine blasting scheme，which can bring the effect of reducing cost and increasing efficiency for mining enterprises，and improve economic benefits and comprehensive benefits.

Key words: ore and rock, blastability, interval analytic hierarchy process, interval approximation