Abstract: Aim at many problems about unmanageable floor heave of deep dynamic pressure soft rock roadways . the geological data of return air roadway in 2 mining area at Jiang Jiahe coal Mine is taken as an example to study the heave mechanism and its Control . Methods field investigation was used to analyze the rock deformation characteristics and internal failure of surrounding rock.and then，mechanism of heave floor have been revealed based on results of field investigation. The comprehensive support method with“bolt + metal net + gunite covering + anchor + grouting + floor anchor”ispresented.Application shows that the heave floor is effectively controlled by the method application, the floor heave amount is less than the maximum value of 10mm and the rate of convergence was less than 1mm/d in the later period. These research results can provide some necessary technical support for some reference for similar roadway.