The #交易对 trading pair refers to the exchange relationship between two assets on the exchange, usually represented as "base currency/quote currency". Recent studies have found that the choice of trading pairs directly affects market liquidity and price discovery efficiency. Diverse trading pairs can enhance trading flexibility, but too many options may dilute liquidity and reduce overall market depth. Especially in the cryptocurrency market, popular trading pairs have a high concentration, reflecting asset value and trading enthusiasm. In the future, optimizing the structure of trading pairs will help promote market stability and the accuracy of asset pricing.