Based on time series stationary and Granger causality test Model, it is an empirical analysis on the dynamic relationship between stock trading volume and stock price that shows that price-volume relationship is stable in China's stock market. And there is a bi-directional relationship between volume and price, that is, volume has a significant guiding on price and vice versa. We study the great volume and stock price volatility, as well as trading strategies. The study shows that a great trading volume can bring investment opportunities which exist mainly when stock price callback and again back on the process of exploration after the great volume generated.