Abstract: To ensure the stability of overlays and structures is a necessary prerequisite for the construction of underground coal transportation roadway.Taking underground a coal transportation roadway under an expressway as the engineering background, field investigation, theoretical analysis, numerical simulation and other methods are used to carry out in-depth research.The results show that the surrounding rock mass of the underground coal transportation roadway is grade Ⅴ, and the quality of the rock mass is poor.The section form of the underground coal transportation roadway is selected as a straight wall three-center arch, its specification is 5.4 m×3.8 m(width×height), and it adopts molded concrete support, C35 concrete waterproof erosion grade.The local broken section can adopt anchor net spray support, U-shaped steel shed, grouting and other strengthening supports.Through qualitative analysis and quantitative calculation of empirical formula, the minimum safe depth is 50 m.The underground coal transportation roadway is a deep buried tunnel, and the comprehensive maximum displacement of overlying highway piers is 0.092 mm and that of highway pavement is 0.085 mm during construction, which is far less than the standard requirements.Thus, the construction of underground coal transportation roadway has little influence on the upper expressway.