According to site patterns of constructed wetland in Taiwan recently, there are several compound patterns with serial or parallel system design as well as single free water surface system. These compound system designs have faced challenges from aquatic vegetation selection and maintenance mechanism to sustain their water treatment effectiveness. Therefore, in this research, an experiment has been conducted to comprehend vegetation water treatment effectiveness from five Taiwanese native aquatic plants. In addition, an advisory report for three selected sites has been presented to obtain the improvement from the operation and maintenance of each site. Finally, suggestions for further research activities have been given to cope with basic parameters and application techniques in next three years. Of research results are as follows： 1.By the wastewater treatment experiment of five native aquatic plants, most of BOD and NH3 removal by plants have become stable when hydraulic retention time reached 4 to 5 days and 2 to 3 days. 2.Among five test plants on the floating mat base experiment, cattail might be the best wastewater treatment plant for combining BOD and NH3 removal effect. 3.Through the verification of current operation treatment wetland sites, most of them were constructed by the serial layout concept, and the average of hydraulic loading was 0.16 m/day. The optimal operation condition in BOD loading was in the range of 30~40 mg/L, and on that status the average removal could be sustained on the level of 40% ~ 50%. 4.Through the valuation, monitoring and examination for three selected constructed wetland sites, advisories for self monitoring checklist, manual of operation and maintenance, and vegetation and sediment control mechanism have been presented to each management partner. 5.A workshop for exchanging experiences and techniques on constructed wetland maintenance has been held. 124 participants have shared their knowledge in the indoor discussion and field experienced visit. 6.About 50 pieces of technical report international information of on site water quality control, including treatment mechanism, scope of application, design criteria, and valuation methodology, have been collected in this report to enhance application reference for our domestic challenges. 7.In this report, suggestions for further research activities with total 30 million NT dollars have been given to cope with basic parameters and application techniques in next three years.

aquatic plants, wastewater treatment effectiveness, site maintenance