In 2007. Hainan Province is the southernmost province in China, including Hainan Island, Xisha Islands, zhongsha islands, Nansha Islands and the surrounding South China Sea. In 2007, China's Ministry of Education issued the "High School Education Popularization Plan". It is clear in the document that by 2020, compulsory education in senior high school will be fully popularized. Hainan Province is the first city to start 12 compulsory education according to the national policy, including Danzhou City, Hainan Province. China's second largest island, located in the northwest of the South China Sea, covers an area of over 30,000 square kilometers.