选取我国2013—2018年沪深A股上市企业作为研究样本，对制度环境、政府补贴与企业研发投入之间的关系进行了实证检验，并进一步分析了企业所有制对上述关系的影响。实证结果得出：制度环境与政府补贴有助于提高企业研发投入；制度环境强化了政府补贴对企业研发投入的激励效果；相比较国有企业，制度环境、政府补贴对非国有企业研发投入的促进作用更强。

This paper selects China's A-share listed companies from 2013 to 2018 as research samples to empirically test the relationship between institutional environment, government subsidies and enterprise R&D investment, and further analyzes the impact of enterprise ownership on the above relationship. The empirical results are as follows: institutional environment and government subsidies are conducive to increasing enterprise R&D investment; the institutional environment strengthens the incentive effect of government subsidy on enterprise R&D investment; compared with state-owned enterprises, institutional environment and government subsidies have a stronger promoting effect on R&D input of non-state-owned enterprises.