Most river dock slopes are steady at the early stage of its application, but the river bed topography in front of the slope may change over time under the action of current, resulting in the deformation and sliding of the slope, which leads to the displacement or even overall slipping of the dock structure. Based on an engineering case, this paper analyzes main causes of the deformation and structure displacement of a piled dock due to the bed evolution, probes into the engineering measures for restoring the stability of the slope, and studies the prevention and remediation measures for the deformation and sliding of dock slope due to the bed evolution.