How do the manufacturing companies with a successful transformation of service strategy manage to finish such up-gradation with adaption? And what’s the basic evolutionary path like? Previous studies did not make a full explanation and answer. In this study, three local service-oriented manufacturing enterprises which have upgraded their strategies will be studied with their evolutionary process, then a theoretical model of the up-gradation path of manufacturing enterprise service strategy will be summed up. The theoretical model shows that: the upgrading process of manufacturing enterprise service strategy is an increasingly upgrading one that is based on a couple of problems existed in the course of manufacturing enterprises’ exerting their “core competencies ” into the market competition. Compared with previous studies, this theoretical model highlights the evolution of core competence in strategic upgrade phase, and how the problems existed in each evolutionary process promote manufacturing enterprises to sum up their service strategy up-gradation from the perspective of customers, which in turn provides a theoretical basis for the transformation and up-gradation of service strategy of traditional manufacturing enterprises.