Abstract: Mine development system is not unchangeable.With the relay of stoping sections and levels, rational production concentration and improvement of the equipment level, the underground mine's development system will need transformation in certain time, with the transformation centered on the extension of mine development, transformation of the production system, and the alteration and expansion the product shafts.The change in the development system can have great impact on the mining, safety, mine look and economic benefit of the production shaft.In light of the real situation of Henan Tongbai Yindongpo Gold Mine, the paper analyzes the factors that should be considered in the design for the development system extension, and puts forward some problems that should be solved in the production relay.

Key words: Development system, Extension, Shaft