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党的十九届五中全会提出，以推动高质量发展为主题，加快构建以国内大循环为主体、国际国内双循环相互促进的新发展格局。在这样的发展背景下，开放发展面临着新形势、新使命和新要求。开放作为经济发展的重要途径和根本动力，高水平开放为畅通“国内循环”注入新动能，为“国际循环”稳定发展发挥引领作用，为国内国际双循环联动发展开辟道路。因此，如何全面衡量区域开放，制定有效的区域开放政策至关重要。正是基于上述背景和问题，本文对新发展格局下如何推进高水平的开放，发挥其对经济高质量发展的引领作用进行研究。

首先，基于双循环的新发展格局视角梳理了开放发展的背景和意义分析发现，当前环境下衡量我国各省域开放发展水平更适合从国际开放、区际开放和区内开放即三重开放全方位出发。构建三重开放综合评价体系，系统衡量了我国各省域开放发展水平。通过测度结果分析发现，三重开放水平呈逐年上升的趋势，同时开放水平发展不平衡，呈现阶梯状分布，东部与中西部差距在持续扩大，区际开放不足和区内开放滞后是形成我国开放发展不充分不平衡的重要原因。

其次，在分析开放与经济高质量发展关系的基础上，基于区域经济发展相关理论，选取2009—2019年我国30个省份面板数据进行实证分析发现：（1）三重开放、国际开放、区际开放和区内开放对区域经济高质量发展具有显著的促进作用，开放水平的提高与区域经济高质量发展具有同向性。（2）从空间效应看，三重开放、国际开放、区际开放和区内开放对经济高质量发展的空间溢出效应估计值显著为正，产生显著的直接和间接影响效应，说明本区域的开放发展对邻近区域经济高质量发展具有正向溢出作用。（3）从开放与经济高质量发展的空间互动系数看，三重开放、国际开放、区际开放和区内开放均呈现正的空间互动效应，说明在国际和国内市场间存在良性的协作机制。（4）区内开放相较于国际开放和区际开放对区域经济高质量发展具有基础性作用，国际开放、区际开放和区内开放在促进经济高质量发展过程中存在协同效应。

最后，结合理论分析和实证分析结果，从国际开放、区际开放和区内开放三个维度提出新发展格局下如何推进高水平的开放，以及发挥对经济高质量发展的引领作用的建议。

The fifth Plenary Session of the 19th Central Committee of the Communist Party of China (CPC) proposed to promote high-quality development as the theme, accelerate the construction of a new development pattern with domestic major cycles as the main body and international and domestic double cycles promoting each other. Against this background, open development faces new situations, new missions and new requirements. Opening-up is an important path and the fundamental driving force for economic development. A higher level of opening-up will inject new impetus into the smooth development of the domestic cycle, play a leading role in the steady development of the international cycle, and pave the way for the interconnected development of both domestic and international cycles. Therefore, how to measure regional opening comprehensively and formulate effective regional opening policy is very important. It is based on the above background and problems that this paper studies how to promote high-level opening up and play its leading role in high-quality economic development under the new development pattern. 

Firstly, from the perspective of dual-cycle new development pattern, the paper analyzes the background and significance of open development and finds that it is more suitable to measure the level of open development at the provincial level in China from the perspectives of international opening, regional opening and intraregional opening, namely threefold openness. Through the analysis of measurement results, it is found that the threefold openness are on the rise year by year, and the development of opening up is unbalanced, and the lack of inter-regional opening and the lag of regional opening are the important reasons for the inadequate and unbalanced development of China's opening up.  

Secondly, based on the analysis of the relationship between open development and high-quality economic development and the relevant theories of economic growth, the findings are as follows:(1)Threefold openness, international opening, regional opening and intraregional opening play a significant role in promoting the high-quality development of regional economy, and the improvement of opening level is in the same direction with the high-quality development of regional economy. (2) From the perspective of spatial effect, the estimated value of spatial spillover effect of threefold openness, international opening, regional opening and intraregional opening on high-quality economic development is significantly positive, which has significant direct and indirect effects, indicating that the regional opening development has a positive spillover effect on high-quality economic development of neighboring regions. (3) From the perspective of the spatial interaction coefficient between opening and high-quality economic development, threefold openness, international opening, regional opening and intraregional opening all have positive spatial interaction effects, indicating that there is a benign cooperation mechanism between international and domestic markets.(4)Compared with international opening and regional opening, intraregional opening plays a fundamental role in promoting high-quality regional economic development, and there are synergistic effects between international opening, interregional opening and intra-regional opening in promoting high-quality economic development.

Finally, From the three dimensions of international opening, regional opening and intraregional opening, this paper proposes how to promote high-level opening and play a leading role in high-quality economic development under the new development pattern.