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cience and technology. Even if they make very strict environmental standards, their domestic products can reach the requirements of strict environmental standards while such standards may constitute barriers to products from developing countries. In fact, these standards may bee discriminations against products from the developing countries and constitute a means of arbitrary or unjustifiable discrimination between country.Thirdly, the rise of protectionism in some developed countries contributes much to the formation of Green barriers. In modern market economy, petition is more severe than before. The domestic industries are directly facing petition from the products of other countries, and they will urge their governments to take effective measures to protect them from the foreign products. While because of the multilateral negotiations of WTO, the tariffs have been greatly cut down and the use of nontariff measures has also been restricted. Therefore, many developed countries have to resort to some legal restrictions of importation such as Green barriers to protect their home industries, which gives rise to the increase of Green barriers.2. The main forms of Green barriers tradeIn accordance with the related provisions of WTO Agreement on Green Barriers to Trade, the Green barriers are usually in the forms as follows: Green TariffSome developed countries would impose import surtax on products that may cause pollution or harms to the environment. If such measure is abused, it will constitute a Green barrier to trade. Green StandardsGreen standards refer to those pulsory Green standards provided through legislation. With their superiority in economy and technology, developed countries tend to make higher Green standards with no consideration on the interests of the developing countries. Such high Green standards will in fact constitute a barrier to the products from developing countries which are inferior in technology. Package RequirementsCertain developed countries stress too much on the protection of environment and require the products should be packed with materials that will have no harm to the environment. I