The study on the causes of eutrophication shows that internal pollution sources and external pollution sources are the main causes for the eutrophication .

Through the supervision of five typical families of Xinzhou, and based on its testing results,it elaborates the actuality of indoor air pollution,main source,damage of pollution as well as the supervising methods,so as to bring forward some concrete methods of protecting indoor pollution and reducing indoor pollution.

As the economic development and the life standard improvement, indoor pollution has been paid more attention.

The source and harms of indoor pollution are summarized,the incorrect recognition of indoor pollution is clarified,and control methods for indoor pollution are introduced.

Because the indoor air pollution problem is serious more and more, this paper surveyed the complexion of the indoor air pollution, and educed that the contents of SO2、NO2 were higher than the others in the lampblack pollution, and also the contents of SO2、formaldehyde were higher in the tobacco smog pollution, while the contents of formaldehyde were higher in the indoor decoration pollution.

After comprehensive harnessing the outside pollution had been effectively controlled,the endogenous pollution which was caused by polluted sediment would be become main nutritional load.

Dredging bottom sediment which is universally used,is an important measure to improve the condition of flood discharge、to increase the volume of lakes、to clean out an endogenous pollution、to meliorate water environment and to renew a water ecosystem.