Enterprise Resource Planning (ERP) system in companies can be implemented to Multi National Corporation (MNC), Larger Enterprise, and Small & Medium-sized Enterprises (SMEs). In China, 99% of all companies can be categorized as SMEs. With a decade of high-speed economy development after entering the 21st century, traditional Chinese SMEs want to find a new management model to improve work efficiency and increase business opportunities. This study finds the factors affecting the diffusion and successful implementation of ERP in Chinese Nanjing manufacturing SMEs. It will lead to the conclusion that ERP investment and implementation, which could be used as project guideline by the management of SMEs or companies that adopt ERP in intend to implement them. The objective is to provide Nanjingâ€™s SMEs implementing ERP with knowledge about ERP implementation factors.