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在当前的国际形势和国内经济结构转变之下，消费已经成为推动我国经济高质量发展的主要驱动力。我国拥有庞大的消费需求市场，在消费侧还存在较大的拓展空间，但大量“需求外溢”反映出我国供给侧产品质量不高、生产能力有限以及服务供给不足等问题。数字经济时代，随着消费市场各个领域和大数据、云计算、人工智能等数字技术的深度融合，以及移动支付和各种智能终端的广泛应用，形成了许多全新场景消费。因此，如何更好地利用数字红利，助推消费提质扩容，推动形成数字化生活，实现更高质量、更有效率的发展对满足人们对美好生活的向往意义十分重大。

本文在梳理国内外相关文献、把握我国数字经济发展、居民消费变化的基础上，考察了数字经济发展对居民消费结构的影响及作用机制。第一，构建了数字经济发展通过产业结构、人口结构、收入水平、社会保障进而影响消费的理论分析框架；第二，依据数字经济内涵和现实背景共从渗透与应用水平、效益与规模、研发创新能力三个维度，选取2011-2019年省级面板数据，构建我国数字经济发展水平测度体系，采用熵值法对我国各省（市、自治区）的数字经济发展水平进行衡量；第三，建立了附加数字经济发展水平指数的静态面板模型和QUAIDS模型，采用OLS等计量方法，从省域宏观视角，实证分析数字经济发展对居民消费水平和各项消费支出比重的影响。主要结论如下：

（1）据我国数字经济发展水平测度结果（DEDI值）显示，2011-2019年数字经济发展水平在全国范围内特征呈现出明显的梯级布局，因数字基础设施建设、地理位置、资源禀赋及科研投入力度不同，各方面因素交织，一、二、三梯队之间地区差距悬殊，存在着地区性的“数字鸿沟”。从区域层面上来看，2011-2019年各地区数字经济发展水平局部均有增长但差距较大，东部地区数字经济发展一直走在全国前列，西部和东北部地区数字经济发展水平欠发达，囿于自身经济基础、产业布局、人口结构及科技创新的限制，数字经济发展动力稍显不足，数字化产业及人才难以集聚，似乎走入了"数字经济贫困陷阱"。

（2）数字经济发展对居民消费水平影响显著。实证结果表明，收入水平对居民消费的影响至关重要，居民人均可支配收入的提高可以显著增加居民的消费支出，可见在数字经济背景下，消费函数依然成立。城镇化进程加快对居民消费有明显的正向促进作用，而人口老龄化则对居民消费存在明显的挤出效应。此外，数字经济对消费水平的影响在数字经济发展程度不一的地区稍有不同，虽然结果都是正向显著的，但在DEDI值较低的地区，数字经济对消费水平的正效应略小于DEDI值较高的地区，原因可能与数字化基础设施不完善、网民基数不够大、消费动能不足有关。

（3）数字经济发展有助于推动居民消费结构升级。日常除了生活用品及服务支出外，数字经济的发展对食品、衣着等其他六类消费支出占总支出的比重存在显著影响。其中，数字经济发展会显著提高食品、生活用品及服务、交通通信和文教娱乐消费支出等在总支出中的比重，而对衣着和医疗保健的影响是负向的。此外，实证结果表明，数字经济发展背景下，除居住和医疗保健外，其余种类的消费支出与消费总支出之间存在着“倒 U”型关系，即大多数消费支出与消费总支出之间存在复杂的非线性关系，说明 QUAIDS 模型适合本研究。

Under the current international situation and the transformation of domestic economic structure, consumption has become the main driving force to promote the high-quality development of China's economy. China has a huge consumer demand market, and there is still a large space for expansion on the consumer side, but a large number of "demand spillover" reflects the problems of low product quality, limited production capacity and insufficient service supply on the supply side of China. In the era of digital economy, with the deep integration of various fields in the consumer market and digital technologies such as big data, cloud computing and artificial intelligence, as well as the wide application of mobile payment and various intelligent terminals, many new scenarios of consumption have been formed. Therefore, how to make better use of the digital dividend, boost the quality and expansion of consumption, promote the formation of digital life, achieve higher quality, more efficient development and full of yearning for a better life is of great significance.

On the basis of combing relevant domestic and foreign literature and grasping the development of digital economy and the change of resident consumption, this paper investigates the influence and mechanism of digital economy development on resident consumption structure. Firstly, it constructs the theoretical analysis framework that the development of digital economy influences consumption through industrial structure, population structure, income level and social security. Second, on the basis of digital economy connotation and realistic background from penetration and application level, efficiency and scale, research and development innovation ability three dimensions, selecting the provincial panel data from 2011 to 2019, build digital measurement system of economic development level in our country, using the entropy method to our country the provinces (municipalities and autonomous regions) of the digital economy development level measurement; Thirdly, static panel model and QUAIDS model of digital economy development level index are established. OLS, QUAIDS model and other measurement methods are used to empirically analyze the impact of digital economy development on residents' consumption level and the proportion of consumption expenditure from the provincial macro perspective. The main conclusions are as follows:

(1) according to our country's digital economy level of development, according to the measure results (DEDI value) digital level of economic development from 2011 to 2019 nationwide characteristics of cascade layout, obviously due to the digital infrastructure construction, the geographical position, resources endowment and the scientific research investment, the factors are intertwined, one, two, three tier gaps between regions, There is a regional digital divide. From the regional level, the digital economy development level of each region increased in parts from 2011 to 2019, but the gap is large. The digital economy development level of the eastern region has always been in the forefront of the country, while the digital economy development level of the western and northeastern regions is less developed, restricted by their own economic system, industrial layout, population structure and scientific research environment. The development power of digital economy is slightly insufficient, and it is difficult for digital industry and talents to gather together. It seems that the "poverty trap of digital economy" has been entered.

(2) The development of digital economy has a significant impact on residents' consumption level. The empirical results show that the impact of income level on residents' consumption is crucial, and the increase of residents' per capita disposable income can significantly increase residents' consumption expenditure. It can be seen that under the background of digital economy, consumption function still holds. The acceleration of urbanization has an obvious positive effect on residents' consumption, while the aging of population has an obvious crowding out effect on residents' consumption. In addition, the digital economy's influence on the level of consumption in the digital economy development degree of different regions is slightly different, although the results are positive significant, but in DEDI value lower areas, digital economy is effect on the level of consumption is slightly less than the area of DEDI value is higher, the reason may be related to digital infrastructure is not perfect, the base of Internet users is not big enough, the insufficient consumer kinetic energy.

(3) The development of digital economy is conducive to the upgrading of household consumption structure. In addition to daily necessities and service expenses, the development of digital economy has a significant impact on the proportion of food, clothing and other six types of consumption expenditures in total expenditures. Among them, the development of digital economy will significantly increase the proportion of food, daily necessities and services, transportation and communication, culture, education and entertainment consumption in the total expenditure, while the impact on clothing and medical care is negative. In addition, the empirical results show that, in the context of digital economy development, there is an inverted U-shaped relationship between other types of consumer expenditures and total consumption expenditures except housing and medical care, that is, there is a complex nonlinear relationship between most consumer expenditures and total consumption expenditures, indicating that the QUAIDS model is suitable for this study.