The research focuses on monitoring cultivated land to prevent loss due to urban expansion. By analyzing factors like nature, society, economy, and policy, the early warning system can predict changes in cultivated land quantity and quality. This helps ensure food security and sustainable land use. The study shows that low land prices and lack of market costs for land loss contribute to cultivated land depletion. The early warning system helps gauge the level of risk to cultivated land, which is crucial for maintaining food security.