China has developed a new generation national heat wave warning system targeting health risks. The system classifies risks into five levels: low, medium, medium high, high and extremely high. Unlike previous alerts based on temperature thresholds, it is tailored to regional vulnerabilities and integrates meteorological data with epidemiological evidence. The first national warning was issued on July 2, 2025 by the National Administration for Disease Control and Prevention and the China Meteorological Administration. In 2022, heat-related deaths in China reached approximately 50,900, a 342% increase from the historical baseline (1968–2005). The system analyzes the association between heat exposure and excess mortality from cardiovascular and respiratory diseases. Alerts are spread through television, SMS, mobile apps and social networks such as Weibo and Douyin. The project was pilot tested in four cities: Harbin, Nanjing, Shenzhen and Chongqing in different climate zones.