Abstract: In order to optimize the selection of suitable vegetation group for the Guanghe highway slope， a combined experiment on the local well-grown herb vegetation was conducted. Through seeding experiment of eight kinds of warm-season herb plants in the local area combined with analytic hierarchy process (AHP)， the ecological adaptability was evaluated. Results indicate that， among the eight kinds of warm-season herb plants， Vetiveria zizanioiaes， Cynodondactylon(Linn.) Pers and Paspalum notatum are the best plants which have better ecological adaptability and slope protection function; Zoysia japonica and Zoysia sinica Hance are the second， and the Zoysia matrella and Pennisetum alopecuroides (L.) Spreng are the worst. Therefore， it is suggested that the warm-season herb plants of Vetiveria zizanioiaes， Cynodondactylon(Linn.) Pers and Paspalum notatum should be chosen as the Guanghe highway slope protective vegetation. The research results provide a theoretical foundation and a technical support for Guangzhou and other subtropical zones.

Key words: highway slope, vegetation protection, ecological adaptability, analytic hierarchy process(AHP), warm-season herb plants