This project would investigate the potential health effects of green space exposure, mainly focusing on cancer. Green space exposure could have a harmful or protective effect on cancer incidence. We do not know the relationship between these two factors. Only one study conducted by Demoury et al. in 2017 evaluated this relationship. This project would be completed in 1 year. Considering that green space exposure is regarded as an essential part of modern city life, this research topic is important in public health.