Abstract:Chaos widely exist in nature and shows also exist in biological system by the it erations of biological models since 70‘s of 20 th century. For decades ecol ogists have been searching for evidences of existence of chaos in natural popula tions but got limited catches. This puzzled them. Is it the reality in nature or because of the bad data and method? The detection of chaos in natural populatio n is a significant and difficult issue. Based on the introduction of concept and theory of chaos, the method...