Abstract: The ecological environmental quality of the Economic Zone in Western Coast of Taiwan Strait ranks the top of China, but the ecological security is facing serious challenges due to the vulnerability and contamination of ecological environment and the rapid urbanization. Based on the pressure-support-response model of ecological security assessment, the indices of pressure, support, and response were calculated by the method of principal component analysis, and then, the ecological security of the Western Coast was assessed. Among the cities in the Western Coast, Quanzhou, Fuzhou, Xiamen, and Putian had a higher ecological security index (ESI), while Zhangzhou, Sanming, and Ningde ranked in lower place. The ESI was not only determined by environmental carrying capacity, but also closely related to the development degree of economy and society. A higher ESI needed stronger economic basis to support.

Key words: Modified bentonite, Remove efficiency, Iron, Cetyltrimethylammonium, Tetramethylammonium