In our country, the most design and construction of the artificial rivers in city landscapes, haveviolated the ecological basic laws.

The community structure of rotifer,including species composition,density,biomass and diversity index,in the artificial river of Ningbo Higher Education Area during the summer in 2004 and 2005 was studied,and the biological assessment of water pollution and the trophic type were conducted by using the method of “indicator organisms” and “diversity index”.

In this paper,in view of the poor water exchange condition and deteoriorated ecological environment in the two bays,a strategic scheme to excavate an artificial Jiaolai canal is proposed,the excavation of artificial canal will link up the Jiaozhou Bay and Laizhou Bay so as to speed up the water circulation in the two bays and improve the ecological en.

Aiming at the issue of ditch network structurally generalized difficultly, the Route System Model is imported to organize the ditch network data, and the ditch is classified morphologically.