This book looks back to 40 years ago for the whole history of China's reform and opening-up and focuses on the role change of China in the relationship with outside world. In the first half part, the author explores China's economic reform and opening-up policy from theoretical analysis and systematic interpretation. In the second part, the author aims to present how China's international roles have changed in recent years and the Chinese appeal and purpose of participating in and improving global governance procedure. The author answers the question of why China has obtained miraculous achievements after its reform and opening-up from academic perspective and provides representative cases with profound but not obscure theoretical interpretation. It is a must-read for anyone who is interested in contemporary China's economy and foreign affairs.