According to the characters of granular media, a new filling procedure for granular media (stationary localized-source procedure) is put forward on the condition that the reproducibility can be realized.

Interconversion between linear source resistivity and point source resistivity with the use of matrix method.;

In the total discharge of point source wastewater,about 76% of nitrogen an.

Modeling the export of point sources of nutrients from the Yangtze River basin and discussing countermeasures;

Fur thermore,it shows the importance and some methods in the solution of the boundary value problems of the point sources.

Based on the water environmental quality analysis of Songhuajiang Rivers in Jilin Province,the water management model is developed,which meets the standards of water environmental functions in different river sections,by integrating point sources with nonpoint sources,introducing response coefficient and optimal theory.

This paper reviews on nonpoint source runoff quality simulation models in foreign cities in order to take them as the reference for the city environment protectors when they manage nonpoint source pollution.

This paper mainly introduces the complement, the condition and the use of applying the way of pollutant discharged trade to reduce the nonpoint source pollution,especially discusses the way to reduce the phosphorus pollution in Tai Lake.