Highway side-slope is one of the most seriously damaged areas in highway construction. Based on an experimental study in the Xi′an-Ankang highway of Shaanxi Province, 19 side-slope protection forms are summarized and analyzed , i. e. , retaining wall, gridiron protection, paved stone slope, drainage consolidation, etc. . 22 scientific research sites were set on tipical slopes and secondary slopes in the Xi′an-Ankang section to observe the changes of shrub stem, diameter and height, lawn coverage, survival rate, emergence rate and growth potential, as well as to analyze the relationship between vegetation growth and environmen-tal conditions. It is clarified that a suitable protection form should be determined by the characteristics of specific engineering. The result from the analysis can offer scientific reference for selecting an ecological sideslope protection mode in highway construction.