Constructed rapid infiltration (CRI) system is a new type of wastewater land disposal technique based on the traditional wastewater rapid infiltration (RI).A summary was made on the definition of the new technique,the background of development,the mode of operation,the mechanism of action,process flow,design parameters as well as some measures and issues to be dealt with.In addition,it was pointed out that CRI system is of a practical significance in innocuous effluent discharge and wastewater reuse.