Based on digital twin and VR/MR, the system uses a one-director plus N-command-post architecture covering five levels of roles — province, city, county, township and first responder. It supports 3D visual simulation of earthquakes, floods, fires, ice disasters and hazardous chemical leaks with 1:1 terrain and scene reproduction. The director starts and stops drills with one click; command posts receive warnings in real time, hold online consultations, push instructions and track tasks; quantified assessment reports follow automatically.