中文摘要：

根据对北京等7个城市的1489份调查问卷分析我国长期经济增长中的公共投资问题，发现制约和促进中国经济持续均衡增长的最主要因素是技术进步；为促进中国经济长期持续均衡增长，公共投资最主要作用是引导战略产业成长，公共投资最应该投向的领域是“科教文体卫”等公益项目，公共投资与GDP最合适比例应在10％左右，公共投资最应该发挥的是社会福利效应等，并提出提升公共投资促进中国经济长期持续均衡增长的相关政策建议。

英文摘要：

Based on 1 489 questionnaires from seven cities, this article has analyzed problem of public investment in long-term economic growth in China. The results show that the primary factor to restrict and promote China＇s sustained and balanced economic growth is technological progress. In order to promote China＇s sustained and balanced economic growth for a long time, the most important role of public investment is to guide the strategic industry growth, the investment orientation should be focus on ＂science, education, culture, sports and health＂ and other public welfare projects, the most suitable ratio of public investment and GDP is about 10%, the most important effect of public investment should be social welfare effect. Finally, some measures about pubic investment to boost the growth and equilibrium of Chinese economy for a long time are proposed.