In recent years, the added value of China's digital economy has continued to increase, and the digital economy has become an important driving force for national economy. The article selects the relevant data of 18 Chinese provinces and municipalities along "The Belt and Road Initiative" from 2011 to 2019, uses the Entropy Weight Method to measure the development of digital economy and regional economy, and studies the correlation effect between the two. Suggestions were made to boost regional economic growth.