Abstract: Water shortage is an important factor that restricts the sustainable development of Beijing . The contradiction between large scale virescence and water shortage was discussed. Based on experiments of planting , cultivation and research on drought-restistance physiology on perennial flowers for servaral years , we suggested that the large-scale planting of drought-resistant and water-saving type perennial flowers in city garden and landscape alleviate the contradiction; Primilary study on multiplication, cultivation and application of available perennial flowers was made.