In light of the niche theory, the study aims to understand the competition among the four telecommunication services, including fixed network telecom, second generation telecom service, third generation telecom service and internet phone in the taiwan market. In this study, we put emphasis on the gratification of the telecom user, because the more gratification the telecom get, the more competition it have. The findings suggest that there are eight factors about the gratification of the telecom consumer, including functional, affection, information-seeking, fashion, uitility, entertainment and pricing structure. In addition , there is strong competition between the fixed network telecom, second generation telecom service, third generation telecom service and internet phone. Four telecom services are good at different factors, therefore, new telecom services would not form competitive displacement for fixed network telecom. Thus, we argue that four telecom services satisfy different consumers needs, and they will survive in different segmentations of telecom market service.