Over the years, the joint construction of the "the Belt and Road" has realized the upgrading from commodity and factor flow oriented opening to institutional opening, from infrastructure hard connectivity to rule standard soft connectivity. From a global perspective, the three major world economic organizations established after World War II are all aimed at reducing or eliminating trade and investment barriers, promoting the flow of goods and factors, and continuously lowering barriers at the borders of countries. According to statistics from the World Trade Organization, the openness of world trade has increased, and the average tariffs on all products have decreased from 10.1% in 2006 to 8.9% in 2021. Non tariff barriers such as anti-dumping, countervailing, and security measures have also been reduced. During the same period, the total global import and export volume has increased from 2.96 trillion US dollars to 55 trillion US dollars, and the total foreign direct investment has increased from 1.2 trillion US dollars to 1.65 trillion US dollars, Commodities and factors flow globally on a large scale. From the perspective of China's practice, China and the "the Belt and Road" countries have achieved fruitful results in the flow of goods and factors. In terms of commodity flow, China and co built countries have gradually become important trading partners. From 2013 to 2022, the cumulative total import and export volume between China and co built countries reached 19.1 trillion US dollars, with an average annual growth of 6.4%. The proportion of total import and export volume with co built countries to China's total foreign trade is on the rise, rising from 39.2% in 2013 to 45.4% in 2022. China has become the largest trading partner of 25 countries along the Belt and Road. In terms of capital factor flow, China and co built countries have achieved two-way interaction of capital. The cumulative two-way investment between China and co built countries has exceeded 380 billion US dollars, of which China's outward direct investment has exceeded 240 billion US dollars. Co built countries have become the preferred destination for Chinese enterprises to invest abroad. In addition, factors such as technology, labor, and data have also achieved two-way flow to varying degrees. From the perspective of development trends, there is enormous potential for the flow of goods and factors between China and co built countries. China actively builds multi-level policy communication and exchange mechanisms with co building countries and international organizations, continuously deepening strategic docking and policy coordination at the global, World Trade Organization, regional, and multilateral levels. A long-term policy communication mechanism is basically formed, led by the head of state diplomacy, supported by intergovernmental strategic communication, assisted by local and departmental policy coordination, and carried by project cooperation between enterprises and social organizations, Continuously promoting various multilateral cooperation to lay a solid foundation for the flow of goods and factors. The joint construction of the "the Belt and Road" takes the "six corridors, six roads, many countries and many ports" as the framework, and basically forms a four in one connectivity pattern of "land, sea and sky networks". Facility connectivity establishes a fast channel for the flow of goods and factors. Co building countries and relevant institutions actively carry out various forms of financial cooperation, improve multilateral financial cooperation mechanisms such as financial institution cooperation, financial payment services, and financial regulatory cooperation, and expand the Silk Road Initiative