Abstract: Reasonable mining methods are the key to safe mining of ore bodies under complex engi⁃ neering geological conditions. In view of the complex engineering geological conditions of the residual ore body in the transition section of an underground iron mine，which is overlying the caving body and below the filling body，combined with the existing production technical conditions of the mine，four alternative mining methods are preliminarily selected，namely，upward horizontal layered filling method，upward route filling method，segmented open field subsequent filling method，and non-pillar segmented caving method. The grey correlation method was used to comprehensively consider a number of technical indica⁃ tors，and the correlation degrees of four alternative mining methods were calculated. The results were 0.508，0.437，0.524 and 0.644，respectively. Thus，the non-pillar sublevel caving method was deter⁃ mined as the best alternative method.

Key words: grey correlation method, mining method, residual ore