Laws should be flexible enough to take account of various circumstances, times, and places.(1) Should laws be elastic enough to take a myriad of things into consideration? It is a complicate question. We have to know laws were invented for regulating behavior of human, and each of them all had their own actual motivation. So we should rely on different cases to talk about it. On one hand, some laws, like Constitution, are the basic laws of a country. And they are based on many years’ experiences that were constantly emended. So it is too essential that legislator can not change it casually. In addition, in the process of implementation of laws, is inevitable to protect some people’s rights and damage another rights. In this time, without laws which were remained relatively constant, the society will become turbulences and confusions. For example, the thieves, stolen jewels and gold, will claim that the legislators should pass a law to prevent them from being arrested; The officials, skimmed off millions of dollars, will assert that the lawgivers should legislate to protect them from accusing; The murderers, killed many people, will profess that the lawmakers should enact to defend them from being punished. On the other hand, were it not for the flexible laws, something would difference. The black people would have to work for the slave owners who are whipping them and disparage them. Or they would have to sit in the back of a trolley car and bear coals from the white people. The women would have to suffer from the exploitation of capitalist employers and patriarchal husband. They would face the inequitable treatment. The children would have to be pushed into child labor to support their families, but the employers would not be punished. They would have to lose their rights to go to school. However, it is rejoice that these things are not happen. The black people have their rights to study in every colleges or universities, to work in every companies or departments, to elect for chairmen or presidents. The women can do anything they long for doing, can be anybody they thirst for being, and can go anywhere they yearn for going. The children enjoy their life in school, because governments are protecting them from working in factories.