During the past four decades, China has become an important manufacturing plant in the global market with rapid economic development and has become the most attractive outsourcing destination for manufacturers. Outsourcing in China is evolving beyond simple low-cost assembly or low-cost production into supplies of innovative products, parts and services. The purpose of this study is to explore how manufacturing firms, especially SME, maintain long-term outsourcing relationship with suppliers in China. By analyzing survey data collected from manufacturing firms operating in China, we find that manufacturer’s dependence on supplier influences outsourcing task conflicts negatively and the proper usage of formal control in the key outsourcing processes reduce outsourcing task conflicts by suppressing supplier’s opportunistic behavior. In addition, Chinese Guanxi is not only a useful governance mechanism for building manufacturing firm’s long-term orientation with supplier, but also has moderating effects between outsourcing task conflicts and long-term orientation. This study contributes to an understanding of outsourcing management in China by demonstrating the importance of Guanxi’s moderating effects, directing effects on manufacturer’s long-term relationship with suppliers and formal control’s reducing effects on outsourcing task conflicts.