Aiming at shortages of bullet propellant charging in present China, introduce a constant volume charging technique based on high rate rotor structure. Analyze new structure principle and prototype test data. Take certain type bullet as example and carry out mathematical statistics and analysis. The result shows that the technology can realize the rotate continuous charging. Its test efficiency could achieve 240 pieces/min, while the precision could realize ±0.02 g, all the technical indexes have listed at China’s top levels.