Abstract: In order to solve the problem of floor heave of deep well in soft rock roadway with high stress in Linxi Mine, the mechanical mechanism and control technology of floor heave of deep well in soft rock roadway with high stress were studied and analyzed by combining theoretical analysis and field measurement, and the following conclusions were drawn:1) The calculation formula of ultimate failure depth, ultimate failure width and effective sliding force along the sliding surface of both sides of the roadway were deduced; 2) It was judged that the floor failure of return air lane of 1791-2 working face of Linxi Mine will be the form of extrusion flow floor heave and full section failure bulge;3) The floor heave mechanism, the cause of floor heave and the control way are analyzed; 4) The floor heave control technology of "roof, wall and floor under the same control" was proposed. The roof and two sides of roadway were supported by high-strength prestressed anchor bolt net + anchor cable, and the bottom plate was reinforced by prestressed anchor cable anchoring + concrete bottom laying technology; 5) The field industrial test showed that the floor heave of the roadway had been effectively suppressed and can meet the requirements of normal use. The research of this paper can be used as reference for similar projects.