The present invention discloses an electronic system for public traffic, which is integrated with at least one wireless communication system. When or after a passenger gets on and pays by a mobile phone, information about the owner of the mobile phone is detected so as to check or freeze a fund or an overdraft limit of a full fare in an account corresponding to the mobile phone of the passenger. When the fund or overdraft limit is lower than the full fare or a certain numerical value, there will be a prompt of “Insert coins” or “Please recharge”. After the passenger gets off, by detecting or communicating with the wireless communication system of the mobile phone of the passenger by an electronic vehicle device, it is automatically judged that the passenger has got off; or by judging a distance relationship or position relationship between the electronic vehicle device and the mobile phone of the passenger, it is automatically judged that the passenger has got off, and the fare to be paid by the passenger is deducted at the same time or later.