Abstract: In order to strengthen the ecological flow supervision of small hydropower stations and ensure that the ecological flow meets the discharge standards, Jiangxi has developed a provincial-level ecological flow online monitoring system for small hydropower stations, which has achieved a "Four Level" joint construction, sharing and management platform for the province, city, county, and power station owners.We have established a multi-dimensional monitoring format that combines dynamic videos with static images, quantitative monitoring with qualitative analysis, and real-time monitoring with random sampling.We have established an ecological flow monitoring index system and created a hierarchical, real-time dynamic ecological flow supervision and evaluation method to dynamically evaluate ecological flow.Establish an ecological flow warning and supervision system, and adopt a "Four Level" warning system for power stations that do not meet ecological flow standards.By constructing an ecological flow supervision system for small hydropower stations, the bottleneck of difficult supervision of ecological flow discharge in small hydropower stations has been effectively overcome, promoting the transformation of ecological flow supervision from the extensive mode of "whether or not to discharge" to the precise mode of "how much to discharge", and achieving good results, providing a reference for ecological flow supervision of small hydropower stations in other provinces and regions.