This paper is focused on the discussion of methodology of aerial remote sensing applied to comprehensive investigation into water coolent circulation of heat and power plant. Basis for the determination of instrument used

imaging hours

flight course and altitude

and for the calibration of the blackbody reference sources is analyzed both in theory and practicality

and the real time mesurement is made on water surface. Thus

much better experimental results have been achieved. The collected image data is enhanced using image processing facilities. The images of water surface temperature under the influence of different wind directions

the isotherm image and aquatic plants area image are produced. The discussion and analysis made on these results shows that the power facilities have not yet been operated in full load and the cooling potentiality of reservoir has not been fully exploited. It is our suggestion that all of the power plants possessing such conditions and facilities should conduct the investigation of this kind.