The Anhai’ao Bridge located in Pingtan, Fujian is a three-span extradosed cable-stayed bridge with a main span of 150 m. For the first time, its design scheme adopted a fan-shape composite bridge tower composed of five CFST arched tower columns and curved steel pipes. In order to study the spatial force transmission mechanism of this new type of extradosed cable-stayed bridge, a 1∶25 large-scale model was fabricated and a static loading test was performed. Combined with the finite element analysis results of the actual bridge, the loading state of the specialshaped main tower, main girder, and inhaul cable under different individual loads was discussed. The research re? sults show that under the action of vehicle load, the CFST fan-shaped composite tower bears about 10% of the load through the inhaul cable, i.e., the live load distribution ratio between the main tower and the main girder was main? tained at 1∶9. Compared with the continuous girder bridge, the maximum strain and mid-span deflection of the main girder of the extradosed cable-stayed bridge can be reduced by about 10%. As the load level increased to 2.0 times the equivalent lane load, the deflection and strain of the main girder, the force increase of the inhaul cables, and the strain of each tower column of the main tower presented basically the same linearly changing trends. Under the action of vehicle load or foundation settlement, the middle tower column and the secondary tower column of the fan-shaped composite tower bore most of the load transmitted by the inhaul cables and their stress levels were relatively high, and the side tower column supported small force; the load distribution ratio of the middle tower column, the second? ary tower column, and the side tower column was about 10∶10∶1; the steel tube at the junction of the curve section and the straight section and the bottom section of the tower column were the most unfavorable. Moreover, compared with the effects of vehicle load and foundation settlement, the CFST fan-shaped composite tower was more sensitive to the temperature effect, the overall stress levels of each tower column were equivalent, and the top section of the tower column had the highest stress. The above research results can provide references for subsequent research and design of similar structures.