1. Data source: The data of simulated trading is a virtual trading environment generated according to historical market data, while the data of real trading comes from real market transactions.

2. Real nature: Simulated trading is a virtual trading environment, which is used to practice and test trading strategies and does not involve real capital trading. And firm trading refers to trading with real money, involving real transaction costs, profits and losses and risks.

3. Market impact: Since simulated trading does not really participate in the market, its trading activities will not have a real impact on the market. However, the trading activities of real transactions will have a certain impact on the market, especially in the case of large trading volume.