Abstract: There are numbers of disquisition for doubleridge waveguide, but they have not discussed and reported the ridge off center doubleridge waveguide. The influence of the ridge position on the cutoff wavelength of the dominant mode in a doubleridge waveguide is analyzed by the finiteelement method. Transfer cutoff wavelength is given in different ridge position, Numerical results demonstrated that the method is correct and efficient. So the cutoff wavelength can be adjusted by changing the ridge dimensions as well as by adjusting its position