论文在分析高速公路建设对国民经济贡献的基础上,重点论述了用生产函数法计算高速公路建设投资对国民经济拉动的方法,并用这个方法计算了江西省高速公路投资对国民经济的拉动效果。结果显示,以1989~2008年的数据为基础,江西省高速公路资本存量产出弹性为0.0452,即高速公路资本存量增长1%将拉动GDP增长0.0452%。 Based on the analysis of contribution of expressway construction to the national economy, this paper focuses on the method of calculating the highway construction investment boosting the national economy by the method of production function, and uses this method to calculate the effect of expressway investment on national economy in Jiangxi Province. The results show that based on the data from 1989 to 2008, the output elasticity of capital stock in expressways in Jiangxi Province is 0.0452, that is, the 1% increase in the capital stock of expressways will drive the GDP growth by 0.0452%.