Abstract: In order to solve construction problems of large section roadway which crossing ordovician limestone water fault in Jiyang Coal Mine railway crosscut,the pr eliminary support scheme was determined firstly according to engineering analogy. On this basis,this paper analyzed the surrounding rock stability of large section roadway under the threat of confined water by numerical simulation method. Furthermore,the construction technology and supporting structure were optimized. The result showed th at the multi- level grouting reinforcement enhanced the integrity of fractured surrounding rock and decreased the surrounding rock disturbance that caused by excavation. The maximum roof deformation was 84 mm and the floor would not have water inrush risk by using of the optimized supporting scheme. Therefore,the supporting system g uiding by advanced detection and basing on the pre- grouting and the anchor net structure beam could effectively control surrounding rock deformation of large section roa dway which crossing Ordovician limestone water fault. In this way,the supporting system gives full play to the interaction between rock and supports,and the construction s afety of the large section roadway in water conductive fault was ensured.