Abstract: Under the impact of COVID-19,the digital industrial chain shows some unusual development trends.This is mainly reflected in the following three aspects:First,the deepening of the digital industrial chain.The shutdown of offline economy has promoted digital enterprises to expand their sphere of influence,accelerated the expansion of digital industrial chain in public service and manufacturing industry,and also forced traditional enterprises to move their business and personnel from offline to online,which greatly accelerated the digitization process and in fact played a role in supporting economic growth.Second,the differentiation of digital industrial chain.On the whole,the digital industrial chain tends to be more refined and specialized,but there is a divergence among industries.Hotels,restaurants,films,tourism and other industries are more seriously affected by the epidemic despite their high degree of digitalization.Moreover,the differentiation between digital and non-digital industries is intensified.Producer services such as commercial buildings are facing digital impact.Online office and online education may overturn peoples dependence on geographic business districts,headquarters economy and CBD,and rewrite the economic and industrial structure.Third,the digital industrial chain is broken.The epidemic has aggravated the breaking trend of the industrial chain of the digital economy,and Europe and the United States have continuously blocked the import and export of digital technologies and products and equipments.This has caused long-term negative impacts on the global division of labor and distribution of Chinas digital industrial chain,which deserves the great attention of the government and enterprises.

Key words: COVID-19 epidemic, digital economy, industrial chain, differentiation, fragmentation