Abstract: In order to analyze the factors that influence the quality of middle and deep hole blasting in a mine,grey correlation theory is adopted in this paper to rank the factors that influence the quality of blasting according to the principle of advantage analysis.According to the mine production experience at home and abroad and the actual production of a mine,to determine the influence degree of the influence factors on blasting quality from high to low in order for the specific charge,the minimum resistance line,hole spacing,hole density coefficient,thus determine the key factors influencing the blasting quality of specific charge,the minimum resistance line and the bottom of the hole.Based on the actual production,the reasonable value range of explosive unit consumption is selected as ［1.42.0］,the reasonable value range of minimum resistance line is 2.0~ 2.4 m,and the reasonable value range of hole bottom distance a is 2.0~ 2.8 m.

Key words: Grey correlation Analysis, Blasting quality, Factors affecting