China's economic policies have been changed frequently in recent years and,accordingly,the uncertainty confronting Chinese enterprises have increased significantlyAt the same time,“stabilizing foreign trade” and promoting highquality trade have become more and more prominent in Chinese economic developmentThe influences of the uncertainty caused by economic policy on international competitiveness and its mechanism need to be addressed seriouslyBased on the data of Chinese enterprises from 2000 to 2013,this article finds that first,the impact of the uncertainty caused by economic policy on the quality of exported products is heterogeneous with invertedU characteristic;second,the results of regressions in different groups show that the effect is widespread in export industries,and stateowned and highquality companies are more sensitive to policy uncertainty;third,enterprise productivity is an important intermediary of uncertainty affecting product quality:limited policy uncertainty mainly promotes quality upgrading by stimulating enterprises' R&D and innovation,optimizes asset allocation,increases productivity,and enhances industrial competitivity,while higher uncertainty does the opposite;and fourth,market mechanism can reduce the impact of uncertainty on product quality in the long run,while administrative power improves the tolerance of enterprises to policy uncertainty in the short term