Abstract: The article uses Logistic model to analyze the different market variables in the economic cycle, especially, therelationship between the market liquidity, price level and the performance of large-cap stocks, from which the inherent law is found.The effects of Logistic model in predicting the size of cap-style is ideal, these factors can be applied for the forecast of the styles oflarge-cap stocks and small-cap stocks effectively ,and then for the guidance of the development of trade and investment strategies.