Aiming at ecological zone construction, Muping district of Yantai City was selected as the study site. An index system for regional ecological carrying capacity(ECC) evaluation was estabhshed, including factors such as resource carrying capacity, environmental carrying capacity and social supporting ability. Using principal components analysis (PCA) and fuzzy synthetic evaluation model(FSEM) with SPSS and Matlab, the changes of ECC in Muping district from 2006 to 2010 were evaluated quantitatively. Further-more, the main factors which caused the changes of the ECC were discussed. The ECC declined continuously from 2006 to 2010, downgraded from good level to incapable level, especially resources carrying capacity. The analysis results of this study reflected well the actual situation of Muping District, indicating the estab-lished evaluation index system is sensitive to regional ecological environment and has acceptable efficiency and applicability to evaluate ECC in the areas with rapid economic development. It was also confirmed that PCA and FSEM can be applied to evaluate the ECC adequately and operationally.