Abstract: The support of large span roadway surrounding rock is a major problem in roadway support. To solve the difficult controlling problem for the surrounding rock of large span roadway, 42202 open-off cut in Buertai Coal Mine is taken as the research object in this paper. The supporting parameters of 42202 open-off cut were studied by theoretical calculation, numerical simulation and field observation. Then, the best support parameters were selected. The best supporting parameters are that the spacing between the roof bolts is 1 000 mm × 1 000 mm, the spacing between the anchor cables is 1 800 mm × 2 000 mm, the spacing between the auxiliary anchor bolts is 850 mm ×1 000 mm, and the spacing between the forward anchor bolts is 850 mm × 1 000 mm. Ater the support, the maximum deformation of two sides and the maximum subsidence of roof are 37 mm and 28 mm, respectively. The results show that: the design support scheme can meet the requirements of surrounding rock control for large span open-off cut roadway.