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Since the World Health Organization announced the COVID-19 pandemic in March2020, curbing the spread of the virus has become an international priority. Ithas greatly affected people's lifestyles. In this article, we observe andanalyze the impact of the pandemic on people's lives using changes insmartphone application usage. First, through observing the daily usage changetrends of all users during the pandemic, we can understand and analyze theeffects of restrictive measures and policies during the pandemic on people'slives. In addition, it is also helpful for the government and healthdepartments to take more appropriate restrictive measures in the case of futurepandemics. Second, we defined the usage change features and found 9 differentusage change patterns during the pandemic according to clusters of users andshow the diversity of daily usage changes. It helps to understand and analyzethe different impacts of the pandemic and restrictive measures on differenttypes of people in more detail. Finally, according to prediction models, wediscover the main related factors of each usage change type from userpreferences and demographic information. It helps to predict changes insmartphone activity during future pandemics or when other restrictive measuresare implemented, which may become a new indicator to judge and manage the risksof measures or events.

Analysis of the relation between smartphone usage changes during the COVID-19 pandemic and usage preferences on apps