It is difficult to generate jet-shaped He microwave plasma jets in ambient air. In this study, a dual-channel pulsed microwave coaxial resonant discharge device is constructed. An atmospheric pressure pulsed microwave He plasma jet is formed when He passes through the central copper tube. And a spatially layered He/N 2 plasma jet is produced when He and N 2 are aerated through the central copper tube and the resonant cavity, respectively. The spatiotemporal ionization evolution