Abstract: In order to solve the problems of complex process and high cost of filling retaining wall in Zhongguan Iron Mine，through theoretical analysis，stress calculation and economic comparison，the stress characteristics of filling retaining wall and the optimization of thickness parameters are carried out to explore the influence of single filling slurry height on retaining wall，and the economy of two retaining wall construction processes is compared. The results show that when the single filling height is controlled at 1.6 m and the interval between two fillings is above or equal 15 h，the retaining wall is stable，and it can be filled continuously after completely crossing the wall. The wedge calculation method is used to cal‐ culate the thickness of the retaining wall according to the compressive strength，shear strength and anti�permeability conditions，and the maximum value is taken to determine the optimal thickness of 0.6 m. The cost analysis shows that the cost of a single concrete retaining wall is 6 402 yuan，and the cost of a brick�concrete retaining wall is 5 104 yuan. After replacing the concrete retaining wall with the brick-concrete re‐ taining wall，the annual cost is saved by 1.298 million yuan，and the economic benefit is remarkable， which can provide technical reference for similar mines.

Key words: filling retaining wall, stress analysis, thickness of retaining wall, concrete retaining wall, brick-concrete retaining wall