Based on the total cost theory of international trade, this article analyzes the mechanism of trade facilitation to agricultural products export, tests the actual promotion effect of trade facilitation to export of Chinese agricultural products by the United States, Japan, South Korea and 28 EU countries based on the extended gravity model. The project is designed by students and teachers .The research shows that the reduction of cross-border time has a positive effect on China’s agricultural products export, but the promoting effect is weakened by the negative impact of technical trade measures for agricultural products. Further research shows that the effect of cross-border time reduction on Chinese agricultural products export is heterogeneous. Due to the negative impact of technical trade measures for agricultural products, the cross-border time reduction in developed countries has a strong role in promoting China’s agricultural exports; while the cross-border time reduction in non-developed countries has no significant role to promote Chinese agricultural products export, and the technical trade measures involving agricultural product have no inhibiting effect on the promotion of cross-border time reduction. The empirical test also proves the effectiveness of the above research project. Therefore, for the aim to strengthen the export of Chinese agricultural products to the above-mentioned countries, China should not only take advantage of the positive impact of trade facilitation, but also effectively resolve the negative impact of technical trade measures for agricultural products. At the end of this paper, some suggestions and countermeasures are put forward.