The study on partitioning of energy in hypervelocity impact is theoretically significant to resolving problems involving high kinetic energy impact, developing missile intercept technology, analyzing collided spacecraft, and evaluating collision damages. Based on the previous research on partitioning of energy in hypervelocity impact, the kinetic energy of projectile in hypervelocity impact on thick target was divided into four parts, i.e. the deformation energy, the increase in internal energy of target board due to stress wave propagation, the splashing energy of debris，and the electromagnetic radiant energy. Through a combination of theoretical derivation, experiments and numerical simulation, the partitioning of energy in the direct impact of projectile at the velocity of 2.61 km/s on the 2A12 aluminum target was quantitatively calculated. The results of numerical simulation on crater morphology, size and radiant temperature were basically consistent with those of experiments and theoretical derivation. The research results provide useful knowledge in solving the problems of moving vehicle collisions and bird strikes.