It systematically combed the ten year co construction process of the "the Belt and Road" in Southeast Asia, and emphasized its importance in China's all-round diplomatic capability. Since the proposal of the China ASEAN Community of Shared Future and the "21st Century Maritime Silk Road" initiative in 2013, Southeast Asia has taken a priority position in China's neighboring diplomacy. China and Southeast Asian countries have achieved significant results in promoting regional connectivity, economic development, regional solidarity and cooperation, demonstrating characteristics such as endogenous driving force, caring for regional needs, and strategic alignment and guidance. At the same time, it also faces practical issues such as sustainable development, problem-solving, and challenges both within and outside the domain. The article points out that the "the Belt and Road" construction is an important part of Chinese path to modernization and has a profound impact on regional and global development. A comprehensive understanding of the experience and problems of China and Southeast Asian countries in jointly building the "the Belt and Road" is conducive to promoting high-quality development.

1、 Ten year joint construction achievements

The joint achievements and high-quality development direction of the "the Belt and Road" initiative in Southeast Asia over the past decade were summarized in detail. As a key focus of the construction of the 21st Century Maritime Silk Road, Southeast Asia has achieved significant results in joint construction between China and Southeast Asian countries through high-level leadership, signing cooperation frameworks, project implementation, and other means under the principle of consultation, co construction, and sharing. These achievements include close alignment of development strategies, significant improvement in connectivity, leapfrog development of economic and trade relations, rapid advancement of cooperation in new fields, and continuous expansion of cultural exchange channels.

2、 Differences and Similarities among Southeast Asian Countries in the Current Situation of Jointly Building the "the Belt and Road"

The current situation of Southeast Asian countries in the "the Belt and Road" initiative and their national differences and similarities were analyzed in depth. Despite being stigmatized and discredited by the outside world, Southeast Asian countries generally support the "the Belt and Road" as a cooperation platform for joint construction, which is highly consistent with China's development strategy. Southeast Asian countries have different levels of development, most of which have development deficits. China's development experience and the "the Belt and Road" are attractive to Southeast Asian countries. All Southeast Asian countries have signed memorandums of understanding with China to support the multilateral trade agenda.

3、 Promote the joint construction of the high-quality development direction of the "the Belt and Road"

Emphasized the high-quality development direction of the "the Belt and Road" initiative in Southeast Asia, and put forward three principles: jointly discuss, build and share, open, green and honest, and high standards to benefit people's livelihood. China and Southeast Asian countries have demonstrated a demonstrative role in the process of joint construction, especially making significant progress in green development, clean cooperation, and standard system connectivity. For example, the proportion of fossil energy projects has decreased significantly, the number of low-carbon projects has increased, and China Laos railway projects have gained effective experience in honest cooperation. At the same time, both sides have achieved positive results in improving people's livelihoods and promoting employment.