Considering all of the above points, we suggested the CW as the first phase of wastewater treatment. In future research, the outflow of the CW will be further treated by diverting it into fishponds, because at this stage the water has a high DO content and its transparency and other indices make it favorable for fish production. The water discharged from the fishponds will then be used to irrigate a paddy field, thus finishing its third treatment. After this, the water, through river ways, will flow back to the duck farm to finish the whole recycling process. Thus, the CW is only one part of the whole ecological engineering system and this experiment is only a first exploratory step.A study of the whole system calls for longer observations, more experiments and more discussion.