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In this study, SAR images were exploited to observe the dried Lop Nur Lake in Xinjiang of west China. Lop Nur Lake is one of the driest places in the world. It is famous for its "Human Ear Shape" feature in optical remote sensing images. "Ear" feature is also shown in Synthetic Aperture Radar (SAR) images, and even larger because of penetration effect. The universal existence of lacustrine deposit with high water content and salinity in Lop Nur Lake are undetectable by previous remote sensing images. We have made some laboratory experiments about subsurface soils and developed an improved dielectric model for moist saline soil at microwave bands. A field investigation was conducted from October 25 to November 8, 2009 to validate the image interpretation results. As an important indicator for environment degradation and climate change study in arid region, Lop Nur does need a long-term and overall research to answer many scientific questions.