Abstract: As the reduction space of tariff level diminishes, trade facilitation plays a more important role in reducing trade cost, optimizing business environment and promoting economic development of member countries. In the RCEP agreement, cargo release time is an important indicator of trade facilitation. Based on the GTAP model, the time cost of cross-border goods customs release is quantified. By adjusting the import demand of the model, it can reflect the choice of agents to import goods from abroad or buy domestic goods, and simulate the impact of RCEP on reducing the time of goods customs release. The results show that tariff reduction will increase the export volume of China's agricultural products sector by 1.407%, the export volume will increase by 1.457% under the scenario of reducing non-tariff trade barriers, and the export volume of China's agricultural products sector will increase by 16.332% under the scenario of reducing cross-border customs release time. At the same time, it will also promote the export of China's textile and garment industries with special advantages. In terms of China's imports of vehicles and transportation equipment, reducing customs release time for cross-border goods will increase imports by seven times compared to reducing tariffs alone. Reducing the release time of cross-border goods has a significant driving effect on improving China's welfare level, expanding import and export, promoting labor employment and increasing net return on capital. Reducing the time for cross-border cargo release will have a differentiated impact on other RCEP parties. RECP parties should promote regional economic integration by reducing the time for cross-border cargo release as a starting point.