Results from lab-scale experiment show that the Constructed Rapid Infiltration (CRI) system not only surmounts the shortcoming of having a low Hydraulic Loading (HL) of the traditional Rapid Infiltration (RI) system, but also reserves the advantages of the RI system. And it has a wide developing prospect. Based on the consideration of studying the CRI system in detail and strengthening its practicality, an experiment project of constructing CRI system by using natural sands is put forward. An on-site experi...