As a major strategic proposition, the supply side structural reform is a new expression that provides a new perspective and route for China's economic development. It is a new engine driving the 13th Five-year Plan and economic growth, which will determine the direction of China's economic and social reform in the future. What is supply side reform? What role does it play in China's economy? What is at its core? What is its focus? How does it integrate with other current important financial reforms and innovations? What are the possible mistakes that should be avoided? The interpretation and discussion of these issues will help clarify how to view and implement supply-side reform.