Abstract: The theory and practice of market economy seemto have shownthat the operation model of market economy is the cause that leads to the global environment crisis and social unsustainable development . But further analysis proves the unsustainable features of social development resulted fromthe external “non-economic”and the utilitarian principle of two sides of the trade inthe market economy exist in all human being’s society and create ecologically unbalanced phenomenonin other societies as well . Onthe contrary , the market economy followingthe contract rules has not only become the most efficient economic mechanismbecause of its flexibility , but also constrained the utilitarian motives reasonably, which may create the connotations of the non - utilitarian ethic values and alter the external “non- economic”of the both sides involved inthe trade , thus provide a realistic economic base for the ethic value of the sustainable development realization.