In order to study the influence of nozzle length and divergence angle on shock wave focusing detonation ignition and thrust of the 2-stage PDE resonator, a group models with a variety of nozzle lengths and divergence angles are studied by numerical simulation. Analytical results in a run indicate that the effect of nozzle length and divergence angle on jet collision and detonation initiation is very feeble. The average pressure and impulse on unit area of resonator is enhanced and times of shock wave focusing in the nozzle is increased as the nozzle length grows, though the frequency of shock wave focusing is decreased. The axial average pressure and impulse on unit area of nozzle wall is increased as the nozzle divergence angle grows, however, the frequency of shock wave focusing is almost unchanged. In consideration of the composite action of the resonator and the nozzle, the nozzle with a divergence angle of 45°presents the best 2-stage PDE performance.