中文摘要：

本文基于2000—2007年中国工业企业微观数据和海关贸易数据，深入考察了中间品进口对中国制造业企业出口产品质量的影响。结果表明，中间品进口通过“中间产品质量效应”、“产品种类效应”与“技术溢出效应”三个可能的渠道显著促进了企业出口产品质量提升，但该效应因企业生产率水平、融资约束、所有制和贸易方式的不同而具有显著的异质性，且因中间品进口来源国和中间品技术含量的不同而不同。我们还发现，良好的地区制度环境有利于强化中间品进口的产品质量提升效应。此外，行业出口质量的动态分解显示，行业出口质量的提高主要得益于集约边际，扩展边际的作用有限；资源再配置效应对行业出口质量提高的贡献高达55％，其在中间品进口促进行业出口质量提高中发挥了关键作用。

英文摘要：

How does intermediate input imports impact firms＇ export product quality？ Based on the firm-level micro data and highly disaggregated customs data from 2000 to 2007, this paper analyzes the effects of the intermediate input imports on Chinese manufacturing enterprises＇ product quality. The results show that ：Intermediate input imports has a positive effect on manufacturing firms＇ product quality through ＂input quality effect＂, ＂product range effect＂ and ＂technology spillover effect＂, but the effects are signifi- cantly different among firms with different characteristics, including different productivity levels, different financing constraints, different ownership of export enterprises and different ways of trade. Also, the magnitude of the effects differed by import source and the quality of the intermediate input. The further test shows that, a good institutional environment is conducive to strengthen the positive influence of intermediate input imports on export firms＇ product quality. Lastly, the industrial level dynamic decomposition results show that, the industrial aggregate quality growth is mainly from the intensive margin, while the extensive margin is much smaller. This paper confirms the judgment that intermediates imports are beneficial to im- prove firms＇ product quality from a micro level, and it also has important policy implications for us to objec- tively evaluate the economic performance of our intermediates imports and the implement of China＇s trade balance strategy.