The individual ecology and population ecology of Neosalanx taihuensis Chen introduced into Dianche Lake in 1979-1985 as well as resource variation are observed and analyzed. It is believed that the physical and chemical environments and food foundation in Dianche Lake are preferable for growth and reproduction of Neosalanx taihuensis Chen.therefore their periods of growth and sexual mature are shortened .Several months later after its introduction on April 1979 the Neosalanx mdcbed up to its sexual mature on November the same year. The hatching baby fishes began to breed on April-May the third year. In this case, three breeding populations were formed in one year, namely spring population, fall population and winter population, but their life cycle is still within year. It is clear that the population develops, very fast. From 1980 to 1986, the total catching yield amounted to 10 million kg. The highest yield was in 1984 and 1986, respectively, reaching 3 million kg. The annual average is about 100.8/ha.