In order to research the wharf structures deformation characteristics under water level cycles circulation in the mountain rivers, the paper relies on the first-stage project of Funing port in Yunnan Province and establishes a three-dimensional finite element model of the overhead sloping wharf. Based on the waterrock interaction, it mainly studies the overall deformation characteristics of overhead sloping wharf, the horizontal displacements of piles, the piles top settlements and the retaining wall instability mode under the water level cycles circulation. It also obtains the wharf structures deformation development trends, meanwhile, the paper predicts the failure modes and features of overhead sloping wharf under the action of water level changes. The results can provide a reference for further studying the interaction between wharf structures and bank slope located in the mountainous rivers and its time-varying characteristics.