A gasdynamic gun driven by gaseous detonation was developed to address the disadvantages of the insufficient driving capability of high-pressure gas and the constraints of gunpowder.The performance of this gasdynamic gun was investigated through experiments and numerical simulations.Much more powerful launching capability was achieved by this gun relative to a conventional high-pressure gas gun,owing to the use of the chemical energy of the driver gas.To achieve the same launching condition, the initial pressure required for this gun was an order of magnitude lower than that for a gun driven by high-pressure H2.Because of the presence of the detonation, however, a more complex internal ballistic process of this gun was observed.Acceleration of projectiles for this gun was accompanied by a series of impulse loads, in contrast with the smooth acceleration for a conventional one, which indicates that this gun should be used conditionally.The practical feasibility of this gun was verified by experiments.The experiments demonstrated the convenience of taking advantage of the techniques developed for detonation-driven shock tubes and tunnels.