Abstract: Environmental issue has received more attentions with development of the society and economy. Recently, ecosystem health assessment has been considered as a hot topic in the field of ecological environment. In this paper, we took the Yellow Sea and Bohai coastal areas, covering 131 counties, as the study area, and evaluated health level in each county that is identified as an individual evaluation unit. According to the latest data involving society and economy, we established the ecosystem health assessment model under the framework of PressureStateResponse (PSR). Multiple factors were taken into account in this model, including the population, society, economy, environment, landscape pattern and policy. Furthermore, we calculated the ecosystem health index in each county by the established model. The results showed that ecosystem heath levels in 84.73% of the study area reached the qualified level or above, indicating that the overall ecosystem in the Yellow Sea and Bohai coastal areas was relatively healthy and has selfadjustment ability resisting to natural and anthropogenic disturbances. Finally, this paper also analyzed the potential pressures threatening the ecosystem and provided suggestions for improving the ecosystem heath.

Key words: municipal sludge, vegetation restoration, coal gangue slope,  harmful substance., water environment, growth media