The present invention relates to the field of shared bicycles, and in particular, to a navigation system for a shared bicycle, comprising a main vehicle lock control unit, a display unit and a navigation module; the main vehicle lock control unit controlling a display screen to be turned on/off; the display unit at least comprising a display screen; the navigation module performing travel navigation according to GPS signals. The present invention further relates to a multimedia system for a shared bicycle, comprising a main vehicle lock control unit, a cloud server and a display unit, the display unit at least comprising a display screen; the cloud server pushing multimedia data to the main vehicle lock control unit, the main vehicle lock control unit controlling, according to a preset condition, the display screen to display the multimedia data. The shared bicycle is provided with a navigation-enabled display screen to provide navigation to the user, helping the user to travel and preventing the user from vi
