Abstract: Based on the mode analysis theory of waveguide resonator, a new class of TM dual-mode waveguide filter is intro-duced in this paper, and the microwave filters are designed by using this kind of resonator. The filter has the characteristics of small size, high Q value and is easy to be tuned and installed. The filter resonators are designed with TM120 and TM210 dual mod-els, and the resonator size can be flexibly designed to meet a variety of requirements. The electromagnetic simulation software is used to design and optimize the filter, and a variety of physical structures are analyzed, including the coaxial structure to achieve input / output filter, high order filter and cavity resonator plane arrangement structure. A Ku-band filter has been manufactured and its performance is excellent, and the test data is consistent with the simulation data.