Based on the experimental analysis of the 26 stream water natural purification sites funded by EPA of Taiwan, numerous case studies of USA and Japan, and the sharing/exchanging experiences by Japanese scholars Keinosuke MOTOHASHI and Yasuo Ozaki, who were the keynote speakers on the symposium on May 26th, we proposed the operation and management of natural purification technology of stream water quality as the followings： 1.Regarding the local parameter, Kv ( 1/day), the BOD and NH4+ proposed value for FWS/SSF artificial wetlands was 0.32 and 0.26; SSF was 0.65 and 0.19; and underground filter tank was 0.11 and 0.06, respectively. 2.The treatment range of FWS/SSF artificial wetland for BOD and SS is 4~60mg/l and 40~200mg/l, respectively. SSF system is best applied to sites with small area, large flow, and SS<30mg/l. The underground filter tank can treat BOD>50mg/l, however, if its HRT is longer than 1day, clogging may occur. 3.Taken the influence of rainstorms and typhoons into consideration, six species of aquatic plants best suitable for the constructed wetlands are: Cyperus imbricatus, Typha angustifolia L., Marsilea minuta, Phragmites vallatoria, Eriochloa prrocera Retz, and Eleocharis dulcis. The planting interval is recommended between 0.8 and 1.0 meter. 4.Regarding the design options, it should consider three factors：treatment water capacity, area of the treatment site, and water quality of the inflow and outflow. 5.As for the strategy for the next three years on the stream water natural purification technology, it is recommended that with local parameters, model assessment, and integrating the technology from abroad, to compile and edit “water purification by ecological engineering design and construction handbook”.

purification technology for stream water quality,construct wetland,operation and maintain