By means of investigation and research for the serious reasons and present situation of soil erosion in Lianshan, the authors think we should take the follwing measures to prevent soil crosion: 1. By means of converting farmland into forest and grass and planting trees on bare mountains to strengthen the controlling of biology; 2. To pay more attention to the measures of immigration; 3. To pay more attention to the scicntific agricultural production to strengthen the controlling of biology; 4. To combine agricultural production with the measures of engineering to strengthen the controlling of engineering.