Abstract: This paper has analyzed the calculation precision of G?S transformation and Hankel transformation, when n = 12 or 16, G?S transform applicability is wide and can assure accuracy, and the relative accuracy of Hankel transform is up to 10-6 orders. Based on time?domain airborne electromagnetic method in time domain and dipole?dipole device 1?D forward modeling algorithm, , the authors analyzed the precision of response to airborne electromagnetic wave when different parameters were selected. The results show that the G?S transformation value of an influence on calculation accuracy is considerable, and selection of parameters of Hankel transformation filtering has small effects on calculation accuracy.