Abstract: Using the method of set pair analysis identical degree, taking a coal mine mining in No.6 Minig Area under super thick unconsolidated stratum of the Quaternary as an example, the article selected four evaluation indexes including waterproof pillar's vertical height, monthly production, coal costs per ton, and mining recovery according to seven alternative mining methods, and identified an optimal evaluation sets through evaluating the four evaluation indexes comprehensively, and calculated the closeness degree of various methods and the optimal evaluation sets. The mining method with big closeness degree is the best plan. Based on this, the article got the best mining method under different waterproof pillar's vertical heights. It is shown that the result of the evaluation by set pair analysis is well consistent with that by multi-objective decision.