Abstract: Rainwater utilization is an important way to solve water shortage in city. There are researches in theory and technology, and the LID technology is one of advanced technologies of using rainwater in China. In this article, the method of studying the purification ability of wetland plants was used to explore several kinds of terrestrial plants’purification ability for CODMn, TN, TP 3 pollutions within 24 hours. The research showed that, the terrestrial plants had the ability of cleaning polluted rainwater; there was a big difference between the different plants on the removal of CODMn, TN, TP. Also those plants presented the purification ability in different concentrations of rainwater. The results of this study provided the guidance for the plant configuration in LID technology to a certain extent.