Based on Zhaojiazhai coal field of Xinzheng mine area in Henan Province, through the testing and statistical analysis, the relationship between coal approximate analysis and log parameters and its models have been established, and the logging response mechanism of coal quality was studied. The results show that between approximate analysis and log parameters exists an obvious correlation. The correlation between the coal quality indicators and the log parameters is determined by the content of organic matter and inorganic matter in coal, the coal property, the coal structure, the coalification and other factors.