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在犁式拉张断层剖面中，依据面积守恒原理，建立剖面中断层与上盘地层形态之间的解析表达式。该表达式假定为上盘地层受单剪（ｓｉｍｐｌｅｓｈｅａｒ）形变、下盘整体保持不形变。上盘块单剪的方向是随意的而且在所预测的断层和地层形态方面有重大的影响。笔者采用ＦＯＲＴＲＡＮ７７语言，在３８６微机上实现了该方法，应用任意改变初始断距和单剪角，可快速直接得到犁式正断层的延伸状况。
Based on the principle of conservation of area, an analytical expression is established for the profile of the sectioned fault and the upper plate in the plow-tensioned section. The expression assumes that the upper formation is subjected to simpleshear deformation and the lower plate as a whole remains undeformed. The direction of single shear of the plate is arbitrary and has a significant impact on the predicted fault and formation patterns. The author uses the FORTRAN77 language to implement the method on the 386 microcomputer. By applying any change of the initial breakage and the single shear angle, the extension of the plow-type normal fault can be quickly and directly obtained.