Abstract: In order to solve difficult problem of supporting coal minesump roadway in Hujiahe Colliery of Shanxi Bingchang Group,numerical simulation method was applied to analyzing problems in original supporting design and bottom arch supporting was put forward.Numerical results showed that strength of whole bearing structure could be improved effectively with bottom arch and by strengthening roof and sides supporting strength,plastic zone of surrounding rock reduced largely,severe floor heave deformation and roof subsidence was controlled obviously.