Chengdu Hi-Tech Industrial Development Zone is the first batch of national-level high-tech industrial development zones, the core area of the China (Sichuan) Pilot Free Trade Zone, and it is currently the special customs supervision zone with the most complete functions and the best policies in China. The zone mainly develops electronic information, biomedicine, airport economy and new economic industries, and has gathered 116,000 enterprises of various types. Among them, there are more than 1,800 foreign-invested companies and 128 of the world's top 500 investment companies.