Abstract: The changing trends of Chinese main board market financing and GDP from 1991 to 2013 were analyzed and the VAR model was applied to explore the relationship between A share financing in Chinese main board market and GDP. The results showed that A share financing in Chinese main board market exerts a positive impact on GDP， whose maximum (0.3001) appeared in the tenth year. Through the growth rate of Chinese main board market financing in Shanghai and Shenzhen Stock Exchanges exceeds that of GDP， the contribution of A share financing in Chinese main board market to the fluctuations of GDP is comparatively small. It is obvious that China capital market is running actively and effectively， and the moderate changes of A share will not lead to the fluctuations of Chinas national economy.

Key words: main board market, financing scale, GDP, VAR model