Abstract: Based on a relativistic magnetron with six same cavities, the operating characteristics of transparent cathode are analyzed. A relativistic magnetron can work in 2 mode easily, when the number of metal strips of the transparent cathode is the same as resonant cavities. However, it can work in mode easily when the number is half of the resonant cavities. According to the theory, changing the position of angular orientation of the rotating sector transparent cathode can realize the frequency hopping in the relativistic magnetron. A transparent cathode is designed. Its outer radius is 15 mm. Meanwhile it has six sector metal strips, and each strips angular orientation is 20. The particle simulation software is used to calculate two models, the magnetic field is maintained in 0.75 T and the operating voltage changes from 600 kV to 800 kV. The results show that it can work in 2 mode when putting metal strips on angular position and anode blocks in alignment, while it can work in mode when making each metal strip and each resonant cavity in alignment. It demonstrates that the frequency hopping of the relativistic magnetron can be achieved by rotating the position of angular orientation of the sector transparent cathode.