Abstract: The traditional land reclamation is an after-treatment method.This method has a long reclamation cycle and a low land recovery rate, which cannot protect the soil in time.With the introduction of the theory of concurrent mining and reclamation, the concurrent mining and reclamation technology shows certain superiority in the reclamation of high phreatic area.For the concurrent mining and reclamation of coal mines, due to the measures should be taken during the subsidence process, the processes and trends of ground subsidence under different mining conditions have different effects on the timing of reclamation.Therefore, it is especially necessary to study the timing of reclamation under different mining depths.In this paper, the indoor simulation method is used to simulate the dynamic subsidence process of 8 mining stages in 6 mining depths (500 m, 600 m, 700 m, 800 m, 900 m, 1 000 m).Based on the simulation results, it is concluded that the timing of the concurrent mining and reclamation is delayed with the increase of the depth of mining, and the optimal land reclamation timing under each mining depth is selected.At the same time, it is found that under the conditions of the mining area, when the mining depth reaches 921 m or more, it is basically the same effect as in collapse stability reclamation.