Abstract: The production capacity of underground metal mines is closely related to the drilling in mining operations. In order to improve mine production capacity and economic benefits of mine， such issues as drilling efficiency， drilling precision， drilling depth that affect the production capacity of the mine， and blasting effect after operation are investigated. The problems in application of YGZ90 drill， QZG80A DTH drill， jumbo in the mine， and their advantages and disadvantages are described， and the characteristics of drilling with different lithology and different depth are respectively demonstrated. The related test data are obtained through field test. After contrasting the test data， the key factors influencing the mine production capacity are explored， including blasting mode， production devices（drilling）， hoisting and transporting way； Through analysis on these key factors， the solution to restrict these factors or the effective improvement are put forward. Finally， the effective ways to improve the mine production capacity is to modify the drilling devices， which can significantly enhance the mine production capacity， and increase the economic benefit.

Key words: Underground metal mines, Mine production capacity, Rock drilling, Blasting