Abstract: On the basis of researching into the lithology,the sedimentary structure, the log facies and the analysis of grain size, and of applying computer technique, electronic microscope and X-ray diffraction in He formation 3 of Shuanghe area, it is pointed out in this paper that the sediments are deposited by both gravity flow and tractive current. The major sediments are gravity flow deposits. Three kinds of gravity flows, i.e.debris flow, grain flow and turbidity flow, are divided by the main support mechanism of sediments,and depicted the depositional properties of subfacies and their distributed patterns in space.

Key words: Shuanghe area, He-3 formation, Gravity flow, Space component, Sedimentary system, Sedimentary model