In 1985, Vienna Convention on the Protection of Ozone Layer was signed and approved. It calls for all the countries to adopt pressing actions and cooperatively to protect the ozone layer.

Later in 1987, the Montreal Protocol on Substances that Deplete the Ozone Layer was approved and set up the timetable for the elimination of main ODS. The whole globe steps actually on the protection of ozone layer. Later, three revisions are presented in 1990, 1992 and 1997. Following are the brief introductions of Vienna Convention, the Montreal Protocol and the executive systems...