2012 Spring International Conference on Environmental Protection Engineering (CEPE-S) will take place in Xi’an China, 26-29 May, 2012. The conference CEPE-S is held under the 2012  Spring World Congress on Engineering and Technology (SCET2012). The SCET 2012 is composed of several conferences on the frontier topics in the engineering and technological subjects. The SCET2012 conference proceedings will be published by IEEE, and the accepted papers will be indexed by Ei Compendex.