In view of the sea ice risk in winter operation of offshore economic structure in cold regions, the research of early warning and monitoring technology is carried out. A risk forecast model is established based on the ice-induced failure analysis, and an Internet of Things monitoring system for sea ice risk is constructed. The completeness, synchronization and reliability of the monitoring information are ensured by the development of water temperature and depth profile monitoring system, sea ice factors image monitoring system and structural response monitoring system. The real-time risk warning is ensured by the development of sea ice forecasts model. With the oil and gas platforms in Bohai as the example, the accuracy of the monitoring data are verified, and the safety in the production is ensured.