Holding companies include Hainan Real Estate (Group) Co., Ltd., Hainan Taixin Mining Co., Ltd., Hainan Tianneng Electric Power Co., Ltd. and Haikou Konghai Microfinance Co., Ltd.; There are more than 20 large enterprises inside and outside the province, such as Xinhua Airlines Holding Co., Ltd., Hainan Yangpu Development Co., Ltd., China Southern Power Grid Co., Ltd., CNOOC Hainan Natural Gas Co., Ltd., Yuehai Railway Co., Ltd., haikou meilan international airport Co., Ltd., Hainan Eighth Five-Year Plan Port Co., Ltd. and SDIC Yangpu Port Co., Ltd. ..