Abstract: This paper studies the deformation mechanism and the damage features of the large-section roadway surrounding rock under the conditions of soft rock, to determine reasonable and effective supporting forms and parameters, with the large-section gate of Gaojialiang coal mine as an example. Based on the roadway section shape and size, using the site monitoring and numerical simulation methods, the anchor, the net and the cable combined supporting system are designed. The results show that the supporting forms and parameters are effective to control the deformation of the surrounding rock, and the supporting is good, economic, reasonable, and reliable; the supporting system provides a basis for similar projects and some new ideas for resolving the difficult problems of large surrounding rock deformation and of poor stability, in supporting the soft rock roadway.