外商直接投资是实现我国经济高质量发展的重要推动力，推动经济高质量发展、推进现代化建设必须始终高度重视利用外资工作。当前，面对世界外部环境的变化，我国利用外资面临新形势、新特点、新挑战。在推进“更高水平对外开放”过程中，如何“稳定外资基本盘”，在更高水平上引进和利用好外资，特别是高质量FDI，是摆在面前亟需解决的现实问题，是实现中国经济高质量发展的关键问题。本文利用2003-2016年中国30个省市、自治区的面板数据，在理论机制的分析基础上，采用工具变量法、中介效应和门槛模型等方法，实证检验了FDI对我国技术创新与经济发展质量的影响及其作用机制。研究发现：FDI、环境规制显著地促进了中国经济发展质量的提升，FDI与环境规制的交互项显著地提高了中国经济的发展质量，环境规制对FDI具有一定的“筛选”作用；FDI、环境规制对中国经济发展质量的影响具有区域异质性和时间异质性，东部沿海地区和内陆地区差异明显，2008年爆发的“金融危机”事件，短期内对我国经济发展质量产生了显著影响；FDI会通过技术创新、产业结构和生产率效应等途径和机制影响中国经济发展质量。相比FDI的技术创新和产业结构效应中介传导途径，FDI的生产率效应机制作用更为明显。FDI显著的促进了生产率的提高，而生产率的提高是驱动经济发展质量的主要源泉和动力；FDI通过技术创新这一中介途径对经济发展质量产生了与理论预期相反的影响。进一步分析发现，技术创新及FDI对经济发展质量的影响具有显著的门槛效应，表现在不同的技术创新水平区间内对经济发展质量的影响也是不同，技术创新及FDI均需达到一定的门槛条件才能促进经济的高质量发展。本文深化了对FDI影响经济发展质量途径和机制的认识和理解，提供了一个具有前瞻性全新的视角，为我国更好的引进和利用好外资，促进技术创新，提高经济发展质量等政策的制定提供了有益的参考依据。本文也给我国应对全球性的“新冠”疫情对经济的冲击带来政策启示和相关经验教训。

    Over the past 40 years of reform and opening-up, China′s economy has maintained rapid growth, and has made a great achievement that amazed the world. In 2010, it became the world′s second largest economy. However, extensive economic growth has led to increasingly serious problems such as waste of resources and environmental pollution, which have seriously affected the sustainable and green development of the economy. It urgently needs to transform economic development model that relies on the input of a large amount of labor, energy, and other traditional factors, and transform to a total factor productivity (TFP) growth model that relies on technological progress, innovate economic development methods, and achieving high-quality economic development. Foreign Direct Investment (FDI) is an important driving force for achieving high-quality economic development in China. We must always attach great importance to the use of foreign capital in the process of promoting high-quality economic development and modernization. Technological innovation capability is the most critical manifestation for a country′s strength, which depends not only on independent R&D, but also on international technology spillover such as FDI. FDI is an important way to take advantage of late-comer advantages and accelerate innovation and development. At present, China′s economy has shifted from a stage of high growth to high-quality development. In the process of "higher level of opening to the outside world", how to attract and make use of FDI at a higher level, especially with high-quality, to promote innovative development, which is a practical problem that needs to be resolved urgently. Based on the above realistic background, this paper fully draws on the existing literature and explores the ways and mechanisms of FDI affecting high-quality economic development. The paper uses the panel data of 30 provincial-level regions in China from 2003 to 2017 to conduct an empirical analysis of theoretical expectations by using the instrumental variable (IV-2SLS), intermediary effects and threshold models. The research found that: under the constraints of environmental regulations, there is a significant role in promoting technological innovation, and "Spillover Effect" is obvious; FDI can improve the quality of China′s economic development, and it do not support the "pollution paradise" hypothesis in China; The interaction of FDI and environmental regulations significantly improved the quality of economic development, and environmental regulations have a certain "screening" effect on FDI; The results of the intermediary effect show that FDI will affect high-quality economic development through three pathways such as technology innovation, industrial structure and productivity effect; compared with the transmission channel of technological innovation and industrial structure on FDI, the effect of production efficiency mechanism is more obvious. FDI has significantly promoted the increase in productivity, and it is the main source and power that drives high-quality economic development; In general, FDI has a negative effect on high-quality economic development through technological innovation, which is contrary to theoretical expectation. Further analysis found that the impact of technological innovation and FDI on high-quality economic development has a significant threshold effect, which is reflected in different levels of technological innovation. Both technological innovation and FDI should reach a certain threshold level to promote high-quality economic development. Based on the above conclusions, this paper reveals the following policy implications. Firstly, we must increase the intensity of FDI, increase the level of opening-up, effectively bring into play the reversing effect of environmental regulations, and efficiently promote high-quality economic development. Secondly, we must adhere to the concept of innovation-driven high-quality development, and high-level opening to promote high-quality development. The local government should reasonably formulate the policies in different regions at different stages of economic development based on threshold conditions of technological innovation and FDI for economic quality to avoid the inefficiency of technological innovation and reduce the negative impact of FDI intermediary channels. In addition, due to the influence of the COVID-19 and changes in the domestic and international situation, China′s economic is facing great difficulties and challenges. The government should cautiously implement the economic stimulus policies and measures to prevent a large amount of capital from flowing to traditional pollution and overcapacity industries, guide capital to invest in advanced manufacturing, emerging and environmentally friendly industries, and promote the development of "new infrastructure", "new services", improve production efficiency, advocate a green economy, and achieve high-quality economic growth.