Abstract: Characterization factors of coal spontaneous combustion were diverse and different.Correlativity between indexes of coal spontaneous combustion critic al temperature with low temperature oxidation was studied.Based on temperature-programmed experiment and isolated heat oxidation experiment,the paper determined five critical temperature indexes TJ、TCO、 TO2、TC2H4 and TC2H6.The indexes value of seven coal samples were calculated through formula reasoning and linear fit ting.The correlation analysis and cluster analysis were used to analyze relevance between various indexes. The results showed that the indexes could reflect critical tem perature from different aspects,critical temperatures of different coal samples with low temperature oxidation were different.The variation tendency of TJ、TO2、TCO a nd TC2H4 were the same and had high correlativity,while. TC2H6 had poor correlativity with other indexes,the characterization effects was non-ideal.