RB refers to rebar, and the subject matter of stock index futures is various stock indexes. At present, there are Shanghai and Shenzhen 300 stock index futures, CSI 500 stock index futures and SSE 50 stock index futures in China.

Futures brokers of securities companies with RB qualification introduce stock index futures customers to their cooperative futures companies. RB business is simply that securities companies introduce futures customers to futures companies.

R is based on yesterday's median price. Theoretically, the former position with higher middle price has stronger energy, and vice versa. CR is to calculate the value of "strong and weak points" in a period of time, so as to analyze its role in price fluctuation and predict the amplitude and time of stock price fluctuation.