A three-images isoline correlation interferometric mothod for generating an interferogram of radar comprises a complex images precise co-registration method including the following steps: performing co-registration of a master image and a slave image by a estimate rule g correlating to a noise item Δu, wherein the matching windows of images are all rectangular windows; generating an interferogram by a three-images method so as to obtain a stripe direction image and a stripe isoline window; performing images co-registration again; and an interferogram generating method including the following steps: taking a window centered on each corresponding pixel in the two complex images, correlating the data of the two complex images in the windows with each other to obtain their correlation coefficient C1; correlating the real part of the data of the first complex image with the imaginary part of the data of the second complex image in the same way, thereby obtaining correlation coefficient C2; obtaining the interferogram from the arc tangent of the ratio of C2 to C1. The method can be perfomed only by three images.
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