Abstract: The sheet pile wall with relieving platform is a new type of retaining structure. It is more convenient in construction and has lower cost and nicer shape than the pile-supported cantilever retaining wall and the pile-supported pre-stressed cable anchor retaining wall. Because of its particularity, complexity and existing variable factors, the mechanical behaviors of this structure is unclear. Therefore, based on the similarity theory, taking its general structure form as the prototype, through multiple sets of model tests with geometrical proportion of 71, the earth pressure distribution mode of the structure is studied. The test results show that (1) the earth pressure is zero under the reliving platform; (2) it is recommended to use the m method to calculate the resistance in piles; and (3) the calculation mode should be the stress pattern and earth pressure of the overall structure.