Abstract: Using the method of set pair analysis identical degree,taking a coalmine under super thick unconsolidated stratum of the Quaternary as an example, four evaluation indexes are selected, including waterproof pillar's vertical height, monthly production, coal costs per ton, and mining rate according to seven alternative mining methods, and an optimal evaluation is identified. The paper discusses the calculation process of closeness degree of various programs with optimal evaluation set. The optimal mining scheme of different waterproof coal pillar height is determined, which is taken as basis for each section seam mining program of six-mining area.