Abstract: The concept，key 1inks of research and approach of healthy ecosystem are stated in this paper．A healthy ecosystem can be described and assessed by its vigor，structure and capacity resilience．The key links of research to quantitatively assess the ecosystem health is to define the criteria of the healthy ecosystem．The possible research approach to assessing the ecosystem health is to consider the factors from the ecosystem distress syndrome，capacity resilience，and the health precaution and prevention．Harmony concern of system structure and function should be the foundation of ecosystern health assessment．