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Electromagnetic railgun systems based on capacitive pulsed-power supply (CPPS) have obtained widespread applications because of its obvious advantages over the inductive ones on mature technology, operational reliability, and feasible financial condition. However, the existing CPPS-based electromagnetic railgun system works with low efficiency. In this paper, systematical studies on the CPPS in the synchronously triggered electromagnetic railgun system with constant volume and in the time-delay-triggered electromagnetic railgun system with automatic segmentation are proposed, respectively. In the synchronously triggered electromagnetic railgun system, all pulse-forming units (PFUs) are supposed to be triggered synchronously and the load is simplified as a resistor first. Then, the system performance criteria, i.e., the launch velocity of the armature vend and the system efficiency η, are expressed as the …