Abstract: This paper discussed about the definition of pollution ecology and put forward three interrelations in pollution ecology by expanding the existing definitions, which emphasized the effects of pollutants on organisms. These interrelations described the interactions among organisms, pollutants and environment. The interrelation I is about effects of organism on environment, the interrelation II illustrates the action of pollutants on organism and the interrelation III shows the degradation of pollutants by organism. These three interrelations give the frame of research fields in pollution ecology. It makes the discipline more perfect theoretically.

Key words: threatened fishes, GIS, zoogeographical division, endangered degree.