The massive unbedded sandstone is identified in the field cropout profile of Middle Ordovician Yingtaogou Formation at Hujitai in the western part of Ordos Basin and it is advanced that involving the latest international studies of deep sea depositions, the massive unbedded sandstone belongs to sandy debris current deposits but turbidity current deposits mentioned in literatures. Gravity current deposits including slump deposits, grain current deposits, sandy debris current deposits and gravity current deposits developed in this study area. The gravity current deposits are commonly characterized by: abundant calcarenaceous turbidite and a large scale of limestones lump deposits including limestone sandy debris currents in the lower part; massive turbidity current deposits deriving land in the middle part, and abundant of grain current deposits at the bottom of the middle part; a large scale of turbidity current deposits from land in the upper part. Slump and grain current deposits responsing to palaeostructures reflect that the palaeostructure was a steep slop in topographical during Yingtaogou period at Hujitai.