Abstract: A large span concrete continuous box girder bridge that has been operating for many years are studied, the regional characteristics of box girder temperature distribution are obtained by continuous real-time monitoring of temperature. Considering various factors of box girder surface for heat exchange, the theoretical box girder temperature field is analyzed. By adopting the third kind boundary conditions, the temperature distribution within the box girder at different moment is obtained by finite element analysis. The result shows that the finite element analysis results coincide well with the measured temperature value.