1, stock index futures (SPIF), full name of stock index futures, also known as stock index futures and futures index, refers to standardized futures contracts with stock index as the subject matter. The two sides agreed that on a specific date in the future, the underlying index can be bought and sold according to the size of the stock price index determined in advance, and the difference will be settled in cash after the expiration. As a type of futures trading, stock index futures trading has basically the same characteristics and processes as ordinary commodity futures trading. Stock index futures are a kind of futures, which can be roughly divided into two categories, commodity futures and financial futures.

2. On April 8, 2005, the Shanghai and Shenzhen Stock Exchanges jointly released the Shanghai and Shenzhen 300 Index, which reflected the compilation goal and operation status of the Shanghai and Shenzhen 300 Index, and can be used as the evaluation standard of investment performance, providing the basic conditions for indexed investment and innovation of index derivative products.

3. Candle diagram is also called candle diagram, daily line, yin and yang line, bar line, red and black line, etc. , also known as the "K line". It is based on the opening price, the highest price, the lowest price and the closing price of each analysis period.