Abstract: Science is a inevitable product of human labor,which meets the requirement of living and development of human being. But science in society has a double-sided effect:on the one hand, it has promoted the development of productive forces and social progress;On the other hand, science that practices in society has brought a series of environmental problems. The pros and cons are correlated with the ethical problems of human existence. This article mainly from the angle of ethics explored the ethical relations in scientific development and scientific activities, and analysed the social problems effecting the existence of human in application of science to society, and finally showed that the scientific ethics is a way of human existence.