Abstract: The paper highlights the three key words:city, health and development.On the one hand, it is necessary to understand the city with systematic thinking, to focus on the health gap and health equity of different populations in the same city, and the continuous spectrum of health indicators or disease distribution in the same population.On the other hand, it is suggested to establish a "participatory governance" model in Healthy City development-government for health, to further promote the development of healthy cities.Finally, it briefly introduces the report of "Healthy City 2.0-Towards a Planet City" presented by Professor Hancock at the 23rd International Conference on Health Promotion of IUHPE, 2019 in New Zealand.