The sheet pile wharf with separated relieving platform is a new type wharf. The main structural feature is to install a buried pile foundation unloading platform behind the quay wall of the traditional sheet pile wharf with single anchor to achieve the unloading effect on the quay wall. Based on the engineering prototype， the prototypical numerical model was built. Under the condition of the constant concrete consumption in single-wide pile and wall，the set of comparison models are established. The maximum cross-section bending moment and its edge stress of quay wall and piles are the main criteria to evaluate the effect of structural parameter changes on the bearing characteristic of structure. The results show that， based on the prototype structure， properly increasing the pile spacing and the pile section stiffness can effectively optimize the bearing characteristics of the sheet pile wharf with separated relieving platform under the condition of the constant concrete consumption in single-wide pile and wall， which has a certain reference value for engineering practice.