For evaluating,forecasting and regulating the health of Taiyuan City ecosystem,an evaluation system was established,which includes dynamics,organizational structure,resilience,ecosystem services and health status of population.Based on the evaluation system,dynamic change in the health degree of Taiyuan City ecosystem from 2000to 2009was analyzed using fuzzy synthetic method and its grey prediction model was established using grey system theory.Results showed that health degree of Taiyuan City ecosystem rose continuously.Its health status changed from unhealthy state in 2000-2006to critical state in 2007,which indicates that Taiyuan City ecosystem develops to a healthy direction.Furthermore,according to the grey prediction model,the city would achieve relatively healthy status in 2018and healthy status in 2049.