The paper analyses the characteristics of China′s agricultural disasters: variety of types

severe damage

inevitable occurrence and random distribution. To prevent agricultural disasters

some main engineering treatments are found

such as water conservancy works

afforestation works

treatment works against plant disease and insect pests

treatment and control engineering to cropland contaminations

information system engineering for forecast and monitoring of agricultural disasters. At the same time

the principles of preventing agricultural disasters are put forward: iterative preventing on the basis of occurrence cause of agricultural disasters and taking some related engineering steps on the basis of agricultural disasters prevention in the mechanism of damage so as to reduce the damages to lowermost degree. The paper impersonally analyses current status of agricultural disasters prevention in the country and brings forward four suggestions: monitoring and forecasting measures should be improved; the works of preventing agricultural disasters should be perfectly planed and implemented; the defending system should be established on basis of conception of system works; and the management system should be enhanced.