Abstract: Research of the characteristic of fault He125 is conducted to dissect the relationship between characteristics of the fault and turbidite for explaining the mechanism controlling the nonisotropy sandstone turbidite of downthrow block. The arcuate fault is the combination of fault trough and fault ridge, it is found from the section that is parallel to the arcuate, the fault can be separately divided into three parts, vertical-slip part, dip-slip part and horizontal-slip part from the section that is perpendicular to the fault. The law of the growth index is that arc center is greater than arc flank; and the ratio of H/L (height/length) is that arc flank is greater than arc center. There are some relations between the geometry characteristic of the arc and its dynamic and kinematic characteristic. The different geometry characteristic of the different localities shows the difference of their dynamic and kinematic characteristic. Geometry characteristics of the fault system controlls the distribution of turbidite, on surface, the arc center corresponds the turbidite fan, the arc flank is the boundary of these turbidite fans, the fault trough is the recharging path of the turbidite fan and the fault ridge is the watershed lines of the different recharging areas. Vertically, the lower dip-slip part corresponds far-bank turbidite, and the middle and upper parts correspond slump turbidite fan, which forms a typical corresponding phenomenon of the arc and fan.

Key words: arc-fan coincidence, arcuate fault, turbidite fan, geometry characteristic