The Xiangshan Group, Middle Ordovician, in the south of Helan Mountains, belongs to deepsea turbidity current deposits which are mainly a set of light metamorphic terrigenous clastic rocks with some carbonate rocks and siliceous rock interbed. The Xujiajuan Formation of the Lower Xiangshan Group is made up of grayish green, yellowish green, light metamorphic fine sandstone, calcareous sandstone, siltstone and mudstone（slate）, whose sedimentary environment was a slope environment. The deposits of internal wave and internal tide which characterized by bidirectional cross beddings are found in this Formation. In this paper, the palaeocurrent data recorded in directional sedimentary structure were collected for determining the direction of turbidity currents, the dip of regional slopes in the study area, and the direction of internal wave and internal tide current. The result shows that the palaeocurrent direction of flutes presents a slightly fanshaped from the north to the south and suggests the direction of turbidity currents when depositing. distribution from the north area and a SSW dipping slope, while the palaeocurrent direction of cross beddings are mainly restricted within an elongated zone extending in a NWW—NE direction suggest the direction of internalwave and internaltide current. Analyzing comprehensively the plane distribution of Paleocurrent, the result is that the dip of regional slope and the direction of turbidity current are the same——SSW direction, and the propagating direction of internalwave and internaltide when depositing are NW direction.