The edge- based vector finite element method is introduced to calculate the field patterns in four types of dielectric- loaded double- ridge waveguides of the ridge on theshort side, including double- rectangleridge waveguide, double- V- ridge waveguide, double- elliptical- ridge waveguideand double- trapezoidal- ridge waveguide. The changes of the field patterns of various modes by changing ridge dimensions are analyzed. The figures are considered to be helpful in the design of many microwave components.