In order to solve the problem of the amphibious force projection of the landing force, a balanced loading method for the sub-cabins of the transport mothership is proposed. According to the situation of each sub-cabin of the mother ship, a balanced loading model of amphibious forces is established, and the loading rate of each mother ship is calculated using the loading method of each compartment of the carrier, and the balanced loading plan of the landing force on each carrier is obtained. A case application of a brigade-sized landing force was verified. The analysis results show that the balanced loading method basically realizes the balanced loading of amphibious forces under loading constraints.