Big data this plate can be said to be very hot, the policy is getting more and more perfect, the government's support is getting stronger and stronger, China's big data industry and the digital economy is bound to develop further, the recent issuance of Wells Fargo CSI Big Data Industry ETF, the fund closely tracked the CSI Big Data Industry Index, is the city's first tracking CSI Big Data Industry Index ETF to fill the gap in this area. The proposed fund manager, Carl Cai, also has many years of quantitative investment experience and is worth buying.