中文摘要：

利用我国1978--2008年间的经济统计数据，研究了我国R＆D投入对GDP的影响过程，包括影响滞后时间、作用路径和影响强度．研究结果表明，我国R＆D活动的平均研发周期为5年，但是R＆D活动对GDP作用的综合社会周期为7年，说明我国R＆D活动的平均周期较长且对GDP的作用路径复杂；同时，在目前的资源配置条件下，产业资本投入的效果优于R＆D投入的效果，R＆D投入的效果优于劳动力投入的效果．

英文摘要：

Based on China＇s economic statistical data from 1978 to 2008, it studies the acting process of R＆D investment on GDP, including the delay time, acting routes and impact intensity. The results show that the average cycle time of the R＆D activities per se in China is 5 years while the cycle time of comprehensive social function of R＆D ac- tivities on GDP is 7 years, which implies that the cycle time of R＆D activities in China is rather long and the acting route on GDP is complex; and under the current resource allocation conditions, the invest performance of industrial capital is better than that of R＆D activities while the latter is better than that of labor force.