Telecommunications industry becomes more and more competitive after the ”three laws of telecommunications” were passed in 1996. Service quality which is highly related to the competitive advantages of companies becomes an important issue consequentially. The present study aims to build up a service quality control model on Telecommunications market customer service centers (TMCSC) providing the most frequent and direct contact with clients. In this paper, we used the descriptive statistical analysis, factor analysis, and analytic hierarchy process (AHP) to establish the hierarchy structure of service quality performance assessment of Chunghwa TMCSC and to generate the weights of each criterion. Simultaneously, A modify method is provided to correct the original criterions of performance assessment in TMCSC.