ISO14020 standard (GB24020) , stipulated each country develops environmental mark to plan must of comply with freewill, open, science, justice and prevent 9 basic principles such as trade barrier.

• ISO14020标准(GB24020),规定了各国发展环境标志计划必须遵从的自愿,公开、科学、公正和防止贸易壁垒等9条基本原则。