Abstract: The method of reinforcement on MSE wall by micropiles is put forward. The micropiles penetrate the MSE region of highway MSE wall from road surface and are anchored into the foundation, and then road barrier is connected to the micropiles by connecting pieces, which forms the Micropile-MSE Wall that aims to increase the MSE Wall's local stability, global stability and collision resistance of road barrier simultaneously. In order to validate the collision resistance of road barrier of Micropile-MSE Wall preliminarily, by applying collision loading on the barrier, comparative studies were done on the dynamic response of the MSE walls before and after reinforcement with micropiles through numerical method. The results indicate that through the micropiles penetrating the whole MSE wall from top to bottom, the collision-induced deformation can be restrained by the whole retaining structure. Hence, the collision resistance of road barrier is increased significantly, the collision-induced displacement of road barrier can be reduced by 90% around, and the deformation of backfill and geogrid can be reduced obviously as well, which preliminarily validates the reliability of collision resistance of road barrier of Micropile-MSE Wall.