Data of the measured 3-dimension △T gradient of air magnetic survey and data of conversion of the 3-dimension △T gradient are compared and difference is shown then causes of the difference are explained and the conclusion is made that under current technical condition if data of the 3-dimension △T gradient are needed only the traverse horizontal gradient is measured the gradient of other two directions could be obtained by conversion that would meet deeds of interpretation.%文章通过实测航磁△T三维梯度数据与与由航磁△T换算出的三维梯度数据的比较,找出其差异,并解释了引起差异的原因.得出在我国目前技术条件下,在需要用航磁△T三维梯度数据时,只需实测航磁△T的横向水平梯度,其余2个方向梯度值可用由△T值换算得出,即可达到解释要求.
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