Based on the observation data made in April to October 1988, with the method of Bowen ratio-energy balance, a preliminary study and calculations on the energy balance and the mean evapotranspirtion ratio of a Pinus tabu-laeformis carr. stand was taken in this paper in Jixian county, Shanxi province. The results were obtained as follows.The radiation income of the stand is rich. The flux of evapotranspiration and turbulent heat exchange are 86.2% of the net radiation of the stand on average. The mean Bowen r...