Abstract: With the promotion of coal mine directional drilling technology, the accidents such as sticking and blocking which caused by hole collapse are increasing gradually. In order to deal with drilling tool fracture accident caused by sticking and blocking, the current methods are milling and fishing. Based on the principle of drilling tool milling and fishing technology, the article analyzed the accident reason in 53074 and 53072 fields of Chengzhuang Mine, and introduced the whole process of milling and fishing technology in detail. With the using of drilling tool milling and fishing technology, all the positive displacement motors were salvaged successfully.