Ensure on the basis of the rights to subsistence of article 15 of constitution, because the country realizes this survives and looks after the obligation, its function and role, by the early order guardian gradually, after industrial revolution, life and working attitude to change people, country, capitalist and conflict of labourer relation benefit shape nervous, in order to meet the people's demand and in order to improve the aforesaid relation, force the country to legislate, besides strengthening the existence of the labourer of the country and looking after, legislate to force employers to look after labourer's obligation at the same time. 20th item 1 and article 28 item 1, Basic Law of Germany, after the World War II, run a country principle (Sozialrechtsstaat) social law Establish and found a state in Germany it in five major basic principles, it is the 79th item 3 of Germany's Basic Law that does not get the modification (Unabandbarkeit) Constitutional government basically for order and centre for value clause. The country should legislate to build and construct the social safety (ensure) System (Sozialsicherungsystem) ,Its range mainly contains social insurance, the society in three major pillars of compensating and succouring with welfare service and the society etc.. At this point, court's judgement opinion of Germany's federal constitution thinks, the social law runs a country the principle is forcing legislators mainly, commission of the persons who realize formulating a new constitution. And check and balance through administration, legislating and cooperation between three right of administration of justice, ensure the people to have freedom right of dignity of human personality and equal right, reach the social justice (Sozialgerechtigkeit) Equal with the society (Soziale Gleichheit) Its ideal realm.