Urbanization has greatly promoted human living environment and quality of life, and also caused many “urban diseases”. Healthycity construction as an effective means to cure “urban disease” has aroused common concern of mankind. This paper focuses on the hierarchical characteristics of the urban complex system and discusses the scale conversion effect of active planning intervention for healthy cities. Three levels have been proposed for the active planning intervention: Macro-scale, medium-scale and micro-scale. At the macro-scalelevelthe planning interventionisto cut off the harmfulsource to formulate disaster prevention and action programs against disasters. At the medium-scalelevelthe planning intervention is to strengthen the ability of self-regulation within the urban system to improve urban air quality, recycle water ecosystems, and mitigate heat island effects. The planning intervention atthe micro-scalelevel is tolead a healthy lifestyle to build a high-quality living environment and comprehensively improve people's health.

healthy cities  /  planning intervention  /  population health  /  built environment  /  scale conversion