This paper would present Celestica Inc.Celestica Inc is one of the top 10 Electronic Manufacturing Services (EMS) providers in the world,headquartered in Toronto, Canada. The company is a leader in design, manufacturing, and supply chainsolutions, adding global expertise and insight at every stage of product development.There are four layers in the electronics product life cycle. Layer 4 is the sub-assembler who isresponsible for providing materials and elements like Bossard, providing the fastening elements. Layer3 is the assembler which is called EMS (Electronics manufacturing service) like Celestica, Flex andFoxconn. Layer 2 is the company which is responsible for the systems integration like CISCO, calledas OEM (Electronic equipment manufacturer) and ODM (Electronic design manufacturing). Layer 1 isresponsible for the network operation. Facebook and Amazon are all this kind of company which arecalled as internet service provider.Celestica provides innovative end-to-end electronic product lifecycle solutions including AdvancedTechnology Solutions (ATS) and Connectivity and Cloud Solutions (CCS) to over 100 customersacross multiple markets. The company’s vision aims to provide a specifically differentiated supplychain offering compared to other competitors, through Celestica’s Total Cost of Ownership™ (TCOO)Strategy along with their Ring Strategy as well. In this paper we will discuss the how diversificationstrategy brings a better financial performance to Celestica as well as why and how to implement TCOOstrategy along the supply chain.

Ⅰ.MACROECONOMIC ENVIRONMENT
Ⅱ. Celestica’s Supply Chain
Ⅲ. The metheod of creating competitive advantage
Ⅳ. DISCUSSION AND LESSONS LEARNED
Ⅴ. Conclusion
REFERENCES
ABSTRACT

• Wang wei(Woosuk University.)
• Yuhong(Woosuk University.)