Abstract: Abstract: Ocean loading tidal stresses on the fault of 3574KG-*8 earthquakes with Mge;5.0 in Indonesia region are calculated. The variation of ocean loading tidal stresses with depth, fault dip and fault strike are investigated. The result shows that the loading normal stresses are larger than loading shear stresses on earthquake faults. The ocean loading tidal stress on thrust fault is the largest, and the others are orderly on oblique, normal, and strike slip faults. Loading normal stresses on faults with dip of 0deg;mdash;50deg;have decreasing tendency with increase of dip, while loading shear stresses on faults with dip of 30deg;mdash;50deg;are relatively large. There is no obvious tendency of change of loading stresses with fault strike. Ocean loading tidal stresses, both normal and shear, on different seismic faults all reach the largest values at depth of 15 km, and then decrease with increasing depth. When focal depth is less than 40 km, the order of magnitude of ocean loading tidal stress on faults is equivalent to that of solid tidal stress. Therefore, in studying tidal effect on the earthquakes with depthle;40 km in ocean area, it is necessary to consider the influence of ocean loading tidal stresses, besides the solid tidal stresses.