Aimed at the problem that continuous detonation caused by the jet radial incidence focusing structure fails to successfully complete in the detonation model of 2-Stage PDE proposed by Levin et al,an efficient and rapid filling by changing the incident direction of annular jet is made based on the simulation conducted by FLUENT software.Through the use of high frequency and low energy consumption spark plug preignition tapered channel, annular narrow slot and annular curved surface, the annular detonation wave incidence is enhanced, and the shockwave focusing initiation can be realized in the concave cavity after diffraction the result shows that t single cycle time pf the concave cavity structure is 9.1 ms, the filling time is 7,6 ms, and the working frequency is 109 Hz.