Abstract: Exploring relationships of agricultural information, risk prevention and early-warning analysis has theoretical and practical significance in reducing agricultural disaster losses, ensuring safety of agricultural products, encouraging the healthy development of agriculture. This paper dissected the basic connotation of agricultural risks, discussed the logical relationship among agricultural risks, monitoring, information, entropy and early-warning: the risks were necessary and sufficient condition of early-warning, while the early-warning effectively managed risks, searched for security; the monitoring was the basis of early-warning, while the early-warning was the stretch of monitoring; information got a inverse relationship with risks. The early-warning of agriculture security risks used information to add negentropy and decrease system entropy, which presented the establishment in the evaluation system of agricultural production risk and risk early-warning model system, promoted the theoretical approach and key technology reach in agricultural monitoring and early-warning, accelerated the development of some essential measures like agricultural information discipline that can strengthen the agricultural risk early-warning.