In order to solve the problems of the current mobile power supply technology and meet the future high requirements of land warfare platform, an integrated scheme of integrated starter generator (ISG) for hybrid power system was proposed based on the mobile power supply technology and the performance advantages of ISG was fully used. The control rules of military ISG hybrid vehicle were optimized by considering the characteristics of battery charge and discharge and engine efficiency. The mode switch control strategy and torque distribution control strategy were further proposed. The simulation and verification of control rules were conducted on an ISG hybrid vehicle by building the wartime running cycle with the Cruise-Simulink platform. Compared with the traditional vehicle, the power performance of vehicle significantly improved and the fuel consumption reduced by 30.38%. The torque distribution between engine and motor became reasonable and can meet the drivers torque requirements through the control rules. The SOC values of power battery could also keep within a reasonable range. Most of the working points lied in the economic working area and the operating conditions of engine were optimized. The results show that the proposed control rules for military ISG hybrid vehicles are reasonable and effective.