Abstract: From the ecological point view one must understand the complex environments of the Island, the different environmental requirements of different plants, and not absolute but ecosystematic viewpoint. In order to raise economical efficiency, one has to treat properly the following economical efficiency of certain agricultural problems in Hainan Island. They include exploration and protection of the biological resources, intensive culture for areal increment and reclaimation of the wastelands, development of rubber trees and other tropical crops and trees, lumbering and reforestation of the forest management, dam construction and watershed forest keeping of the hydraulic structure, concentration and separation of animal husbandry as well as catching and culture of the fishery.