This study is aimed to rebuild the environmental rehabilitation, what to increase the benefits of drainage construction and to improve the livelihood space of Yan-shuei and Ta-chou drainage district. Besides flood prevention consideration, the regional drainage system is orientated in four categories: drainage function maintenance, natural landscape, waterfront recreation and ecological system protection/restoration. Through the integral environmental information which includes urban plans contents, water quality investigation, ecological characteristics, regional cultural, landscape connection, historical flood disaster, etc., development opportunities and development orientation is furthermore evaluated in this report. Finally a feasible environmental rehabilitation plan is illustrated; and the associated management program, implementation schedule program, budget and benefits are evaluated.