Recently as the competitiveness and market responsiveness of the companies which have their own production facilities has declined, the cases of using local production companies are increasing. Especially global electronics manufacturing service (EMS) companies, which are based on their professional production technologies and intelligence capabilities, have appeared. The consumer electronics companies and the companies selling small IT products are using the EMS companies increasingly in order to become a market leader and to be more competitive. With the object of proposing ways to improve the outsourcing production plans and especially to help ordering companies manage the EMS companies, we reviewed the status of EMS, analyzed the EMS companies and reviewed the partnership between the ordering companies and the contracting companies from the viewpoint of manufacturing service. In addition, we arranged the evaluation criteria for selection of EMS company. Based on a survey including the interview, we examined the evaluation criteria and draw several implications.