The evaluation on time-varying temperature distribution of composite deck plates of long span bridge is carried out in this study through an integration of knowledge in material science and structural analysis. Two-dimensional heat transfer models are utilized to determine the time-dependent temperature distribution of deck plate, deck trough and deck pavement of the bridge. The solar radiation model is utilized to examine the time-varying temperature distribution. Comparison between the analytical results and the field measurement shows similar properties, in terms of temperature distribution within the deck segment. The made observations demonstrate that the simulated temperature variation of the deck plate based on the solar radiation model agrees well with measurement results.