Engineering projects are the core body of cooperation among countries along the “Belt and Road”. Mainly considering the environmental factor index, a national project construction cooperation factor evaluation system constructed, including 5 first-level indexes, 10 second-level indexes and 27 specific indexes. Using the relevant data from 2019 to 2023, entropy weight method and TOPSIS (technique for order preference by similarity to ideal solution) were used to quantitatively evaluate the degree of cooperation and its influencing factors in 64 countries and regions along the route. The results show that nine three-level indicators, such as the degree of government integrity, the legal perfection of GDP, and commercial convenience, have a significant impact on national engineering construction cooperation. There are obvious polarization and regional differences in the level of project construction cooperation among countries along the route.On the whole, the level of project construction cooperation in the “Belt and Road” countries has gradually improved.

“Belt and Road”  /  engineering construction  /  entropy weight TOPSIS(technique for order preference by similarity to ideal solution)  /  evaluation index system