According to environment vibration monitoring nearly a year and analysis of a piece of two span continuous composite beams, the paper builds three regression model basing on the mathematical statistics method of the environmental temperature and humidity and the combined beam frequency linear and nonlinear regression analysis.The comparative analysis indicates that the four element line· ar regression model considering the temperature uniformity can not only make the environment temper—ature and humidity and the frequency be more ideal regression effect and good prediction, but also has universal applicability.