Abstract: In order to study the relationship between floor heave deformation and abutment pressure in mining roadway of deep well, the return airway in 2407 working face of Tongchuan Yuhua Coal Mine was taken as the research background, and the method combining theoretical analysis, numerical simulation and field observation was used for analysis and research. By establishing the equivalent load mechanical analysis model of roadway floor, the expression of the maximum floor heave of roadway floor under the action of abutment pressure was derived. By FLAC^3D numerical simulation, vertical stress distribution on coal pillar side and coal wall side of roadway with different coal pillar widths was obtained. From the perspective of effectively avoiding the influence of mining, when the coal pillar width was 25 m, the influence of abutment pressure had the least influence on the floor heave deformation of roadway. The field observation results show that the plastic zone on both sides of the roadway is asymmetrically distributed under the influence of mining, and the plastic zone on the coal pillar side is larger than that on the coal wall side. The research results can provide reference for the analysis of floor heave in similar geological environment.