基于2003—2019年中国内地30个省份面板数据，运用中介效应、门槛效应模型实证检验FDI对我国技术创新与经济高质量发展的影响，并进行机制分析。研究发现：第一，在环境规制约束下，FDI技术溢出效应显著，FDI能够促进我国经济高质发展，现阶段环境规制具有“创新补偿”效应；FDI与环境规制的交互项能够显著促进经济高质量发展，环境规制对FDI发挥一定的正向筛选作用。第二，在考虑内生性后，FDI、环境规制及其交互项对经济高质量发展影响的核心结论依然成立，并且存在区域异质性。第三，两种中介效应检验结果显示，FDI通过技术创新机制作用于我国经济高质量发展。第四，整体而言，FDI通过技术创新水平这一中介路径对经济高质量发展产生负向影响，与理论预期不符。

The increasingly serious problems of resource waste and environmental pollution have seriously affected the sustainable and green development of the economy. It is urgent to transform the high energy-consuming economic development model to a total factor productivity (TFP) growth model that relies on technological progress, innovate economic development methods to achieve high-quality economic development. Due to the COVID-19 Pandemic and the changes in the domestic and international environment, China's economy is facing enormous difficulties and challenges. Utilizing foreign capital is an important means for China to open up to the outside world at a higher level, and it is an important part of building a new system of a higher-level open economy. Therefore, it is vital to use foreign capital properly so as to promote high-quality economic development and modernization.#br#Then, in the process of promoting "higher level opening up", it is urgernt to find out how to better introduce and make good use of foreign direct investment(FDI), especially high-quality foreign capital, so as to promote innovation and development. Under the current environmental policy, will FDI have serious adverse consequences for China's environment? Is FDI conducive to technological innovation and high-quality economic development? Does environmental regulation have a positive screening function for FDI? What is the mechanism behind FDI's impact on high-quality economic development? How to make better use of FDI to boost high-quality economic development? The answers to these questions are significant to promoting the high-quality development.#br#Throughout the existing literature, the research on FDI, technological innovation and high-quality economic development has not yet been included in the unified framework for in-depth discussion, and there is a lack of discussion on the impact mechanism and analysis of the possible reasons behind the mechanism.Therefore, on the basis of fully learning from the existing literature, this paper uses the methods such as the intermediary effect and threshold effect to empirically analyze the impact of FDI on China's technological innovation and high-quality economic development and its mechanism with provincial panel data of China from 2003 to 2019. It is found that with the constraints of environmental regulation, a significant role in promoting technological innovation and its spillover effect are obvious; FDI can improve the quality of China's economic development with the constraints of environmental regulation. At present, environmental regulation has an "innovative compensation" effect in China, and the interaction of FDI and environmental regulation has significantly promoted the improvement of the quality of economic development, and environmental regulation has a certain screening effect on FDI. After overcoming endogenity, the core conclusions of the impact of FDI, environmental regulation and their interactions on high-quality economic development still holds, and there are regional and temporal heterogeneity characteristics. The results of the intermediary effect test show that FDI will affect quality development of the economy through technology innovation. In general, FDI has a negative impact on the quality of economic development through the intermediary approach of technological innovation, which is inconsistent with the theoretical expectation. Further analysis finds that the impact of technological innovation and FDI on the quality of economic development has a significant threshold effect, which shows that the impact on the quality of economic development is different within the range of different technological innovation levels. Both technological innovation and environmental regulations must reach certain threshold conditions to promote high-quality economic development.#br#According to the above research conclusions, this paper has the following policy implications. Firstly it is necessary to effectively exert the negative force of environmental regulation and promote high-quality economic development in an efficient and reasonable manner. Secondly all regions should consider its absorptive capacity when introducing FDI. Meanwhile different industries and regions should reasonably introduce the scale of foreign investment and pay attention to the quality of FDI. Thirdly, to better exert the positive technological spillover effect of FDI, it’s essential to consider the different levels of technological innovation in each region according to the different intermediary transmission channels of FDI’s impact on the quality of economic development, and rationally formulate differentiated policies at different stages of development. Therefore, the government should implement reasonable environmental regulation standards according to regional conditions, achieve a balance between environmental protection and economic development, and promote technological innovation and development of enterprises through measures,such as improving the environment for scientific and technological innovation and providing more training opportunities.#br#