The purposes of this research were as following: (1)to study the influences on elementary school student's ecological knowledge after teaching Alien species' course; (2) to study the influences on elementary school student's ecological attitude after teaching Alien species' course; (3)to study the influences on elementary school student's ecological behavior after teaching Alien species' course. The research method was a quasi-experiment. The sample students were the fifth graders in Bade city of Tao Yuan County. They were assigned randomly to the experimental group which includes two classes and the control group includes the other two. The experimental group were employed "Alien Species' Course into Teaching Strategy(ASCTS)".
