Based on a series of small-scale model tests，the bearing characteristics of suction tripod-bucket foundation under horizontal loads are studied，and the effects of the length diameter ratio，load direction and spacing of suction caisson are investigated. The test parameters include three different aspect ratios (length/diameter)，three load directions and three caisson spacing conditions. According to the test results，the characteristics of the load-displacement curve for the tripod-bucket foundation under various working conditions are different. Under the same caisson weight and different spacing conditions，increasing the aspect ratio is beneficial to improve the horizontal bearing capacity. However，before the foundation loses stability，the caisson with a larger aspect ratio results in greater horizontal displacement. The change of load direction has a significant influence on the joint working area of the suction tripod-bucket foundation. When the load direction is 0 degree，the corresponding joint working effect area is the largest，which provides the most benefit to the horizontal bearing capacity of the foundation. On the other hand，when the load direction is 60 degrees，the joint working effect between the caisson and soil is the weakest，resulting in the smallest horizontal bearing capacity. Under the same size and load direction conditions，with the increase of caisson spacing，the bearing capacity increases in different degrees. And the larger the ratio of length to diameter is，the more obvious the increase of bearing capacity is.