In view of the application and development of situation awareness in power system, the typhoon early warning and defense framework based on situation awareness technology is studied in order to cope with the typhoon disaster frequently happened in recent years. This paper summarizes the main research contents and key technologies of the typhoon early warning and defense framework based on the three stages of situation awareness. Firstly, the information needed to be collected in typhoon warning and defense system is summarized and developed in the situation elements collection stage. Secondly, based on the data obtained, the static failure rate of power equipment and the resilience of the grid are assessed real-timely to sense the operating status of the power system in the situation understanding stage. Thirdly, based on the prediction and correction of the typhoon path and wind speed, the risk assessment method of the grid under the typhoon disaster is summarized in the future trend prediction stage, including the risk prediction of the single fault, the mass fault and the chain fault. Finally, the overall framework of typhoon early warning and defense based on situation awareness is summarized, and the future trend of typhoon warning and defense framework is forecasted.