The invention discloses a performance assessment and real-time early warning method based on a GPS data application. The system mobile terminal is installed through a mobile intelligent terminal with a GPS function to collect in real time and save the site and route the GPS data, then the location information at each terminal can be viewed in real time through the use of a background management system of this system; when an exception situation is discovered in a work process, an operation person at the mobile terminal can send related information in real time to the background system, and provides for a management person in the background with short messages, App alarms or phone calls to send the early-warning information to persons in related sectors, the information contains an exception occurring addresses, time and an exception description, and a GPS navigation function; through historical GPS data record combined with the spot checked recorded data, the background persons can statistically analyze the work performance of the staff members. The performance assessment and real-time early warning system can significantly enhance performance efficiency, one device and one system can complete the tasks of information collection, saving and sending, and there is no need to switch between multiple devices or record entries or query in multiple systems.