The study has shown the design of a symmetrical five-port waveguide junction working within the bandwidth from 9 GHz to 10 GHz. For the five-port waveguide junction properly works in a six-port reflectometer, the absolute value of the reflection coefficient of every port must be less than 0. 1. The study has applied the frequency shift method the cutting taper apart method and the mathematic analysis to design a symmetrical five-port waveguide junction.