This Paper is based on the collection of many indoor and field test data,inwhich the progress in and the results of pilot test for underground in-situ breaking-leach-ing of copper ore in Dongxiang copper mine, which was the first in China,are reported,andthe development and application prospects of this technology are described. This paper is ofimportant value and instructive significance to the exploitation of difficult low-gtade non-ferrous and ferrous metal mineral resources