Abstract: With the use of the elastic thin plate theory and energy method principal，the displacement function of main roofs under all caving method and all fill mining method before breaking was created.According to the principle of analog simulation，a experiment was carried out on the movement and damage laws of working face's overlying strata under all caving method and all filling mining method.The research showed：the experimental values of main roof's displacement in all caving method and all filling mining method are in good agreement with theoretical values，and displacement theory model can reflect motion laws of main roofs before breaking; The key strata movement has synchronicity with surface subsidence in all caving method; All caving method leads to the upper strata producing non-uniform horizontal displacement，causing strata extrusion or cracking deformation.It has great influence on overall structural stability of overlying strata; All filling mining method doesn′t lead to the upper strata producing non-uniform horizontal displacement and make inferior key strata play the role of main key strata，which can reduce the redistribution scope of overburden stress，and effectively control the surface subsidence.

Key words: The elastic thin plate theory, Analog simulation, Law of motion, Caving method, Filling mining method