Abstract：The Quaternary formation in Sanhu region of eastern of Chaidamu Basin is rich in gas accumulation. It appears outstanding reflection characters such as "negative anticline"，dim spot and low frequency etc and constitutes magnificent seismic information group about gas accumulation. The delta deposit characterizing short basin growth time (it's mainly concentrated onto Quaternary)，short lithogenous time and low lithogenous level forms an excellent accumulation condition here. Gas with high abundant accumulation and a variety of loose stratum are the reasons for notable distinct seismic information on seismic profiles in Sanhu region.
