Abstract: Ecological rationality put a great emphasis on the influences of environment on human beings and the functions of human gained from the interaction with their surroundings. There are lots of evidences indicate that emotion has ecological rationality from two aspects. First, emotion bears the information of environment because it was shaped by natural selection. Second Emotion can reflect the structure of environment and regulate human behavior automatically. Finally we proposed a model showing the working mechanism of emotion and analyzed the relationship between the devastating effect of emotion and ecological rationality.

Key words: emotion, ecological rationality, rationality, environment.