Abstract: With the combining method of compression test and theoretical analysis, compression deformation characteristics of solid filling are studied, namely deformation process is divided into approximate linear stage, rapid growth stage and stable linear stage, from the result of example; it confirmed that solid compacted filling deformation process belongs to stable linear stage. On the basis of that, through simplified mechanics model, elastic foundation beam model is built with solid waste compacted filling mining immediate roof, the influence that elastic modulus of filling body on immediate roof under the different degree of compaction is analyzed. At last, taking the mechanical model of main roof into engineering project, it obtained good effect.