The Shanghai and Shenzhen 300 Index selects 300 A-shares in Shanghai and Shenzhen stock markets as samples, including Shanghai 179 and Shenzhen 1. Sample selection criteria are large-scale and liquid stocks. Two-way trading system for intraday trading (you can buy up and down, and you can close your position on the same day); Trading hours: 9: 30am to11:30am and13: 00pm to15: 00pm.