Terrain is an important factor affecting airborne gamma-ray spectrometry. The traditional height correction method for airborne gamma survey in complex topography will cause distortion of the correction result. In consideration of the features of dynamic survey and by using the DTM data acquired by airborne geophysical survey as well as the radiation field theory of point radiator and detailed terrain classification, the authors studied the implementation of a terrain correction method utilizing terrain coefficients. A comparison with the result of ground-based anomaly check shows that the terrain correction method applied has achieved satisfactory result in practical data processing and can basically eliminate the impact of terrain.