The Sustainable Development Issues In International Investment Treaties

International investment law is undergoing constant evolution. In the past decade, Big changes in their field than any other branch of international law, and this change continues. Various countries and regions in the world give a high degree of concern and attention for the development of international investment law, and began to try out new ideas and models to deal with the new situation and new challenges. Investment in the host countries are increasingly concerned about their frequent runaway sued in international investment arbitration cases, as well as international investment arbitration system of law, policy space generated by the government in international investment arbitration. They also actively seek new investment model agreements and mechanisms to attract investment to promote their sustainable development.In recent years, the concept of sustainable development has been widely recognized by the international community, the international investment environment is no longer just focus on protecting private interests of foreign investors, but also stressed the economic and social development of the host country,such "sustainable development" can promote the host country and foreign investors to achieve win-win situation."Sustainable development" includes environmental, social and corporate responsibility issues raised by IPFSD, and emphasis on foreign investment into sustainable development in the host country. Countries signed advocates of "Friendly sustainable development" HAS to emphasize investment promotion policies to follow sustainable development goals, And as much as possible to reduce the risk of harmful investment competition.The development of international investment treaties and challenge coexist, It is gradually establishing a coordinated and effective international investment regime. Because the interests of the home country and the foreign country investors’ needs are different, then the balance of benefits and responsibilities between the two becomes very important. The purpose and the aim of the investment treaty increasingly attach importance to the protection of economic development and sustainable development goals of the host country.Sustainable development is a very controversial issue in international investment agreements..The core strategy of the sustainable development is coordinating environmental protection and development, and protect Intergenerational fairness. Its significance has penetrated into a wide range of international economic, and become an important value pursuit in international economic law and in international economic activity. Under the NAFTA regime, many host countries have been accused by foreign investors as a case of indirect expropriation for their environmental measures. Such as S.D.Myers Company v. Canada (1998). These cases make people have to seriously consider the importance of the sustainable development in international investment environment.In the "2012World Investment Report,"UNCTAD developed" investment policy framework for sustainable development.", which to some extent indicates that the latest developments in international investments. This article focuses on the relationship between sustainable development and investment, and challenges for sustainable development proposed by investment treaty.From the macro,This article analyze the understanding of sustainable development in international law,From the microscopic,This article analyze the problem of international investment environment which hinder sustainable development. This paper is divided into four parts, the first part is the understanding of sustainable development in international law. The second part is the relationship between investment and investment treaties and Sustainable Development.The third part is the challenges to sustainable development that proposed by international investment treaties. The fourth part is the implications for sustainable development and international investment treaties.