Based on the extended gravity model, the impact of business facilitation in RCEP(Regional Comprehensive Economic Partnership) countries on China’s OFDI(outward foreign direct investment) was empirically examined, using China’s panel data on OFDI from 2005 to 2020.The results show that the facilitation of business environment in RCEP countries is conducive to promoting the growth of OFDI in China, but the results are different in each sub-indicator of business environment. The facilitation of the business environment in RCEP ASEAN countries has a promoting effect on China’s OFDI, while the promotion effect of RCEP non-ASEAN countries is not obvious. Based on different investment motives, the impact of business facilitation in RCEP countries on China’s OFDI is also different. With the in-depth implementation of RCEP, the business environment of various countries will continue to be optimized, and the level of China’s direct investment in RCEP partner countries will continue to rise.