Abstract：Based on a sponge campus gravity flow ecological filter project, the problems in the project, such as anti-blocking management and plant management and so on, were analyzed and discussed briefly. The results showed that the pretreatment processes such as filter screen filtration, anaerobic precipitation, coagulation and sedimentation were effective in intercepting particulate pollutants in rainwater runoff. Medium local replacement methods, namely mechanical removal, medium solidification and medium covering could better solve blocking problem. The implementation of operating-break and operating-in-shift, regular cleaning and desilting was also conducive to the normal performance of gra-vity flow filter. Since plants were the most important part of purification function and ecological landscape in gravity flow ecological filters, the plant specific selection principle, planting method and reasonable density were investigated. A planting scheme was proposed, in which mosquito repellent plants are planted in the intake unit, algae resistant plants in the middle unit, algae resistant and bactericidal plants in the outlet unit; further, the planting density and daily management method etc were also put forward for some typical plants. Eventually, suspended substances and organic load in the water of ecological filter can be reduced to effectively prevent the ecological filter from blockage and maintain its stability.
