Abstract: Temporal and spatial distribution of earth temperature in China was analyzed based on the daily mean earth temperature at 80cm for 2001-2010. Meanwhile, the correlation of earth temperature with solar radiation was analyzed; the earth temperature prediction model was constructed by taking solar radiation as the predictor. The results show that earth temperature presents similarly seasonal variation in various depths, and reaches a ridge in summer then dropped to trough in the next spring. The long-term evolution demonstrated a rising tendency. We found that the correlation of the 60-day lagged earth temperature to the solar radiation become better after a 30-day moving average on each of the two series. Then, we constructed a prediction model to forecast the periodic fl uctuation of the earth temperature, and got a higher accuracy. Thus this model may be applied in the future.