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中文摘要：
利用世界银行2005年对我国120个城市6826家民营企业的调查数据，深入考察了民营企业所处地区的产权保护水平和融资约束程度对其研发投入水平的影响．在控制了企业特征、企业家特征、行业等因素后，研究发现：民营企业所处地区产权保护水平的提高和融资约束程度的降低，无论是对于促进我国民营企业参与研发活动，还是提高其研发投入强度，均有显著积极影响．进一步分析表明，上述影响总体上对中小企业更为显著．
英文摘要：
Through the 2005 World Bank survey of 6 826 Chinese private enterprises in 120 cities, it investigates the impacts of property rights protection and financial constraints on Chinese private enterprises＇ R＆D input. After other cofactors controlled, it obtains the following main results： increasing property rights protection has a significant positive effect on Chinese private enterprises＇ R＆D input; decreasing of financial constraints is also significantly helpful to promote Chinese private enterprises＇ R＆D input; the positive effects of property rights protection and financial constraints are more significant for relative smaller enterprises.
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