In order to study the distribution of the lateral earth pressure under non-limited state against the wall in compression zone of mining subsidence area. Based on the characteristic that the rigid wall was turned around the bottom of the wall in compression zone, The tests of loose sand and dense sand under RB mode was carried, While the tests of loose sand and dense sand under T mode was carried too. The result shows that: under RB mode, The lateral earth pressure of wall is correlated with the depth and displacement of the wall. The 3d surface fluctuation is large. The distribution of lateral earth pressure of wall nolinear with the depth and displacement of the wall, The lateral earth pressure reach the maximum in the middle of the wall, The resultant of passive earth pressure increased with the displacement of the wall.