With the change of the concept of river treatment,biological engineering has been arousing people's attention. Armed with biological engeineering,the river treatment of rigid engineering has gained successful experience.The paper demonstrates from the following six aspects:the background of biological protection measures;the practical examples of bi- ological engineering on vagrant riverways;the necessity of applying biological engineering on Zhanghe River;mode re- search and the content of construction;the analysis and appraisal of the project benefit;and the appraisal of benefit.Bio- logical protection measures have great significance in changing the appearance of Zhanghe River project,enriching the measures and methods of flood prevention,improving the ecological enviroment of Zhanghe River,and in promoting the harmonious development of people and Zhanghe River.