The wheel of history drove the 21st century, in the new social conditions, we can not be understood as good faith is not lying, says it will do so simple and the new social forms gives more meaning faith, such as we have faith that the original ethical principles into law, up to legal principles, guiding all civil actions, because an important principle of good faith, but also by some people as 'imperial principles.' It requires people to keep promise, keep one's word, and honest. people of goodwill, without prejudice to others interests and social public interests under the premise of rational pursuit of their own interests.