Abstract: Full- scale physical experiments on fires in large spaces were carried out to research the prediction model of temperature field in large space. By constructing the maximum temperature of the smoke temperature curve, the time point when the fire enters the decline stage, and the basic shape of the curve, a mathematical model to express the whole process temperature curve of fire in large space was established and was researched contrastively against the other two models. The results showed that the change and non- uniform of temperature distribution of natural fires in large  spaces can be predicted by both 3 models. The theoretical prediction value of the new model is in good agreement with the experimental value in the peak stage of fire, and can reflect the gradual attenuation of temperature fields in the fire better during the decay phase.

Key words: fire, large space, full- scale experiment, prediction model, non-uniform temperature field