Ensuring the security and reliability of power supply stands as a pivotal necessity in today's modern society, impacting a wide array of critical sectors, including telecommunications, finance, water supply, healthcare, and manufacturing. The effective safety warning mechanism, with its capacity for sensitive and precise hazard forecasting and timely dissemination of warnings, plays an indispensable role in averting disasters and mitigating the resultant harm to life and property. In recent years, extensive efforts have been dedicated to comprehending the behavior of power systems during large-scale blackouts, necessitating simulations to study the impact of diverse factors. Concurrently, the demand for grid risk early warning methods has surged in the realm of power emergency management. This paper seeks to provide a holistic perspective on the subject by delineating three crucial dimensions of the smart grid security defense system.