Abstract: The model of calculating wind field of free atmosphere under the height of 100 km was es?tablished according to the relationship between pressure and height in p reference frame. Meanwhile, the wind field under the height of 100 km was obtained by the geostrophic wind and thermal wind for?mulas according to the temperature data from Nimbus-7. The data comparison between the calculation and the experimental detection with long-range racket shows that the distribution law of the calculated wind field is coincident with that of the detected wind field; and the model of calculating wind field at high altitude is feasible. In order to show the effect of wind field at high altitude, a ballistic contrastive calculation of the long-range rocket was carried out. The results show that the errors of range and side deflection are obviously affected by the wind at high altitude.

Key words: fluid mechanics , applied meleorology , exterior ballistics , wind field at high altitude , long- range shell and rocket , geostrophic wind , thermal wind