Abstract: The research of tectonic coal area is good for gas distribution prediction, combining with the formation principle and distribution regularity of tectonic coal, distribution mechanism of tectonic coal is discussed on the basis of rheology theory of coal of minimum rate of energy dissipation. The maximum stress difference is formed between the high stress area, which includes compression and shear zone, the low stress zone. Under the long-term tectonic stress, the coal has a rheology and flows from the high-stress area to the low-stress zone, leading to the accumulation of tectonic coal in low-stress zone and the thinning or even disappearance in the low-stress area. Taking the analysis of the geological structure features of Chaohua, Gaocheng, Daping coal mines of Xinmi Coal Field as the basis, combining the distribution mechanism of tectonic coal, this paper explores the reasons of sudden increase and decrease of tectonic coal inⅡ₁ main mining coal seam.