This paper presents the improvement of the ATDL model with the height of plane source. Plane source computational area has been determined according to the meteorological definition of wind angle, in order to make the selective meaning of the computational area clear. The author has calculated the quality of the atmospheric environment of Tangshan City using the improved model and find that the results is basically conformed to reality. The data deviation is with in the limits of two times, and the correlation coefficient is above 0.70.