Abstract: Taking the 3# coal seam in Qinshui coalfield as the research engineering background in this paper,the regularity of mine pressure of larege section roadway afer excavation is discussed by using the numerical simulation software of FLAC3D.The research results in this paper not noly contributes to mastering the mine pressure behavior regularity of lage section roadway,but also reveals the otherness rules of mine pressure of difference size section coal roadway in the process of comparison with small section. 　

Key words: Large section, Roadway, Mine pressure behavior, Numerical simulation