Antidumping can boost the affected enterprises to increase the export of non-dumping products of the antidumping originator (trade deflection effect), cause the market competition intensification (competition promotion effect) of non-dumping products in the antidumping originator, and further force the enterprises to promote the quality of non-dumping export products (export product quality spillover effect). Based on the micro-data at the enterprise-product level from 2000 to 2013, this article uses DID to examine the impact of US anti-dumping on China's export product quality of non-dumping products. The results show that US anti-dumping against China has significantly improved the export quality of non-dumping products of the affected companies, which have significant export product quality spillover effect; The trade deflection effect causing the competition promotion effect is the important acting mechanism of the quality spillover effect, thereby, for the non-dumping products, which US has a high dependence on China's imports, many export destinations, high-level intra-enterprise, and in the state-owned enterprises, the export product quality promotion effect of US antidumping against China is little. In addition, the US anti-dumping to China can also force low quality products to withdraw from export market (exit effect) and further to promote the overall quality of the export products while forcing the affected Chinese enterprises to improve the quality of the non-dumping products (intra-product effect). China should implement more neutral foreign trade policy, carry out export product quality promotion project, and sufficiently use the forcing effect of foreign antidumping to China to boost the transformation and upgrading as well as high quality development of the export enterprises.