Abstract: To explore the impacts of stormwater concentrated infiltration in a rainwater garden on groundwater level and quality, the water level in three wells (a control well J1 and two monitor wells J2 and J3) was monitored separately 1 day, 3 days, 5 days and 7 days before and after every rainfall event from May through October, 2016, and groundwater samples were collected to determine the contents of COD, NH4+-N, NO3-N, TN, and TP. Results show that the variation in water level from large to small was J2, J3 and J1 and the stormwater infiltration recharge to groundwater was hysteric with an overall delay of roughly 3-5 days. In J2 and J3, all these contents were increased after a rainfall then rapidly declined, and the contents of COD, N and P in flood season (July and August) were increased slightly, gradually decreased at the end of the flood season, and finally tended to be stable. The results indicate that concentrated infiltration in rainwater gardens is beneficial to groundwater recharge and has no obvious negative impact on groundwater quality.