Tianzhu. Cheng, borned in Huozhou, Shanxi province, P.R.China on 9 Feb., 1979. Bachelor of Law, got from the Humanities and Social Schience School of the University of Electronic Science and Technology of China in 2000. Master of Law, got from the School of Civil, Commercial and Economic Laws of China University of Political Science and Law (Beijing, P.R.China). The author’s major fields are Economics of Law. He worked for the management engineering department of Guangxi University of Technology from 2000 to 2004. Now he worked for the financial and economic department of Guangxi University of Technology (Liuzhou, Guangxi province, P.R.China) for six years. His previous publications concludes: [1]Tianzhu. Cheng, Yue. Lai and Sheng. Dai. Why Personal Relations Matters: Analysis Based on a Game between Pharmaceuticals and Hospitals. the Ninth Wuhan International Conference on E Business. 2010, Vol.3, 2462-2466. [2]Cheng Tianzhu. Jiyu Jingji Fenxi de Shangye Huilu Zhili Celue. Managers’ Journal. 2009, Vol.22, 262-263. He currently interests in economic analysis of civil law.