Abstract: 【Purpose/significance】In the face of the increasingly prominent information security problems in smart cities, the frame⁃ work model of information security impact of smart cities is built to explore the interrelationship between the influencing factors, so as to provide references for improving the information security risk response capacity of smart cities and ensuring the smooth operation of smart city system.【Method/process】Based on the grounded theory, starting from the interview data obtained from semi-structured in⁃ terviews, through open coding, spindle coding, selective coding, saturation testing and other stages, NVivo12 software was used to sort out the relationship between the influencing factors of smart city information security and construct the framework model of smart city information security.【Result/conclusion】According to the three-stage coding analysis, the influencing factors of smart city information security are identified, and the influence of four factors on smart city information security, including users themselves, data service, personnel management and external environment, as well as the interaction between them are clarified, so as to provide a comprehen⁃ sive reference for the construction of smart city information security system.【Innovation/limitation】This study only studies the influ⁃ encing factors of smart city information security, and does not conduct empirical exploration on the information security of smart city at the data level. However, it also provides new ideas for further research on the information security of smart city in the future.