Abstract: In this paper the authors put forward following four conclusions :1. If the forest is denuded, the fine field will become sandy. If we plant the costal shelterbelt, the sand areas will develop the fine field.2. The more the forest is destroyed, the more the agriculture will be damaged. The more the forest is planted the more the field conservation will be made.3. To plant shelterbelt in the rubber plantation is agood experience.4. The forestry management must take selective cut to combine cut with silviculture.