Taken the topside weighing about 10,000 t as an example, the numerical simulation analysis and basin test are carried out on the short distance transportation process of the platform installation by the twin-barge floatover, and the typical cases are compared and analyzed. The results show that: from the six-degree-of-freedom motion of the two short distance transport barges and the force response of the Leg Mating Unit (LMU) which varies with the wave direction and period, the trend of numerical simulation and model test results is similar; from the numerical point of view, the numerical simulation results are less than or close to those of the basin test; when the wave direction is determined, the change amplitude of the cable tension with the wave period is small. The analysis and study of the short distance transportation can provide some reference for the design and implementation of the platform installation using twin-barge floatover.