Subgrade protection mainly includes slope protection, embankment protection and reinforcement along the river.(1) slope protectionThere are two kinds of slope surface protection: Plant Protection and Engineering Protection. Plant protection is mainly aimed at soil slope, which beautifies road, coordinates environment, regulates temperature and humidity of slope, strengthens slope strength and stability The engineering protection is aimed at the rock cutting slope.Because this design is the earth roadbed, therefore chooses the plant protection the effect to be able to be better than the project protection effect.(2) erosion protectionErosion protection mainly aims at the embankment along the Binhai River, riverbank embankment and Shuize area embankment, but also includes the bridge approach road, embankment beside the embankment and other protection.The bank protection can be divided into direct and indirect types.