It is very important to study saline evolution by means of remote sensing images. Based on field survey and previous information, this paper points out that the older lake banks are discovered by Canadian Radarsat-1/S1 SAR images in Jilantai saline area are relicts of lake evolution since Late Pleistocene. On such a basis, the evolutionary process of Jilantai saline lake and the regularity of climate changes in Jilantai saline area are discussed in detail.