In view of the lack of force measurement methods and poor measurement accuracy in the combat planning stage, this paper proposes a set of amphibious force measurement methods based on operational potential energy. Based on the Lanchester equation, the concept of operational potential energy is introduced to form the model expression of operational potential energy, and the force operational planning model based on operational potential energy is deeply established, and the solution method of the force planning model based on operational potential energy is given to form a set of advanced amphibious combat force calculation method. Based on the calculation of amphibious combat forces, the calculation and analysis are carried out. The simulation results show that this method has good feasibility and applicability.