【Objective】 Using the field research method,this research is aiming at the constructed urban rain garden projects, from the perspective of the plant resource application, multiindex investigation and evaluation was carried out, the existing problems and optimization strategies were analyzed, in order to provide the inspiration for rain garden. 【Method】 According to the distribution of rain gardens in Hangzhou urban area, 17 representative rain gardens were selected to be researched on them from the overall application status of plants, plant ornamental characteristics, plant species and structural patterns in different sites and plant ecological characteristics and types in different rainwater treatment areas. 【Result】 (1) There are various types of shrubs and herbs in the rain gardens, where the number of herbs is dominant, while the application of trees is relative less; (2) In the water storage area, the plants that are more drought resistance, water resistance, pollution resistance and purification ability are mainly planted. In the buffer area, plants that are more resistant to drought, short-term moisture and rain erosion are mainly planted. In the marginal area, plants that are more drought-tolerant and more moisture-resistant are mainly planted; (3) There are 66 kinds of plants, which belong to 36 families and 51 genera, with the most species of angiosperms, accounting for more than 90%; (4) The most widely used plants are in Gramineae, Rosaceae, Cyperaceae, Cedaraceae and Leguminosae; (5) Herbaceous plants are mainly perennial, the proportion of evergreen and deciduous shrubs is not much different, and trees are mainly deciduous plants; (6) The proportion of ornamental plants is the largest, accounting for 53.03%, and the colors are rich, among which the purple and white plants are accounting for the most. 【Conclusion】 The overall application status of plant resources is good, but there are also some rain gardens that need to be expanded and enriched in species diversity, such as a lack of plant landscape hues and seasonal richness, a single plant hierarchy, unreasonable plant configuration in some places, and poor plant maintenance in some sites and other issues to be optimized.