The paper,based on the actual construction,makes plans of jacking construction of large-diameter water supply pipes across main canals,introduces some specific methods and the practice shows that they are feasible and reasonable and have achieved satisfactory results.

Methods In the irrigation area of Diaoyutai reservoir in Anhui,a section of the main channel,which the mullicicide measure was imple mented according to the local plan,was selected as a trial spot.

Study on ecological restoration allocation along Jiping Canal of East Route of South-to-North Water Transfer Project;

Research of Gao-gan Canal Pollution and Health Condition of Yangling Dwellers;

The distribution feature of sandy soil and cohesive soil was found out for the main at Tianjin canal of middle route from south to north water transfer project,by using diversified methods of geophysical exploration,for instance,electrical sounding and seismic reflection method and ground penetrating radar.