At the end of 1978, China began the historical process of reform and opening up, and profoundly summed up the lessons of the "Cultural Revolution" and the disadvantages of planned economy. During this period, unbalanced development was highly praised, which basically dominated the economic layout and regional development of China. In order to make some areas rich first, it encourages coastal cities and regions with low cost, quick effect, easy project landing and convenient foreign trade to develop first, and open up the riverside, belt and inland areas in stages, with emphasis and efficiency. Specific measures include establishment of special economic zones, economic and technological development zones and coastal port cities, etc.