Abstract: Dispersion characteristics of the rectangular waveguide grating slow wave system and standing wave factor of the coupling device are studied experimentally. Three kinds of rectangular waveguide gating slow wave structure(SWS) models with rectangular groove, swallow-tailed groove, ladder groove respectively and the SWS with input and output structures are manufactured by the distributed process method. The dispersion and standing wave factor are measured by resonance method. Compared with the theoretical results and simulating results, they match very well.