Abstract: In order to achieve the safe recovery of the top and bottom pillars in the Baixiangshan mining area， and to improve the effective recovery and utilization of resources， the artificial bottom construction process under different parameters in the Baixiangshan mining area are optimized through the mechanics analysis of thin plate mechanics model and Ansys finite element numerical simulation. The mechanical and displacement parameters of three different artificial substructures with different thickness of artificial substructures and different recovery rates are analyzed. The safety and stability of the 44 models is evaluated and analyzed， combining with the safety factor method. The results show that on the premise of guaranteeing the economic optimization of mining， a safe， feasible and economical construction technology of artificial false bottom is obtained， that is， 2.5 m thick artificial false bottom is constructed with 2.0 MPa filling material， and the safety of 50% top and bottom pillar recovery can be guaranteed by the “one- interval-one mining”. The research results can directly guide the engineering design and construction.

Key words: Artificial false bottom, Parameter optimization, Safety and stability, Numerical simulation