Abstract: In order to improve the surveying accuracy,the radio wave refraction error caused by atmosphere medium has to make correction.Aiming at the existing high accuracy radar has been increasingly used for low altitude or super low altitude exploration that the elevation angle of a radar is in about 0 deg,a corrective method of radio wave refraction errors is proposed,which is practical in 0 deg and its nearby elevation angles.This method uses the atmospheric refractivity grads and adopts an integration by parts to solve the problems of normal radio wave refraction error correction,such as the denominator of the correlation formula is zero,so as to be unable to calculate or it may influence the computation speed seriously when the iteration times are too many and so on.So it can be applied in the engineering.The effectiveness of the proposed method is proved through a comparison with the corrective result of normal methods.