A series of model tests are conducted to study the optimal load attachment point for the suction caissons embedded in sands under inclined loading. The factors of load attachment point

loading angle and length to diameter ratio are considered. Based on the load-displacement curves obtained from model tests

the uplift bearing capacity of suction caisson foundations are determined by a suitable failure criterion. Then the optimal load attachment point is obtained by the analysis of the variation of uplift bearing capacity of suction caisson foundations. It is found that the loading angle has a significant role in the uplift beraring capacity of suction caisson foundations; and the maximum uplift bearing capacity will occur when the loading is in the horizontal direction. The effect of load attachment point on the uplift bearing capacity of suction caisson foundations depends on the magnitude of loading angle. The load attachment point has great effect on the uplift bearing capacity of suction caisson foundations when the loading angle is relatively small. The attachment point associated with the maximum uplift bearing capacity is located at approximately 2/3-3/4 of the suction caisson length from the top; otherwise

it can be neglected. Based on the relationship between load and rotation degree of suction caisson

the failure model of suction caisson foundation under horizontal loading acted on the optimal load attachment point is analyzed.