Abstract: High-energy and high-intensity proton accelerators were widely applied in the fields of the nuclear industry, civil applications and fundamental researches. In this scenario, a 2 GeV continuous wave (CW) fixed field alternating gradient (FFAG) proton accelerator was proposed by the China Institute of Atomic Energy. Development of the 44.4 MHz high power waveguide-type RF cavity with high quality factor and high shunt impedance is extremely important. The simulation study results on four geometries of waveguide-type RF cavities, which were rectangular, omega, racetrack and boat ones were presented. It is found that the boat shape cavity has the highest quality factor and the highest shunt impedance, and is the most promising candidate for the 2 GeV CW FFAG proton accelerator. In order to obtain the fabrication technology of the boat shape cavity, and conduct high power RF conditioning study in the future by using the existing power source for the 230 MeV superconducting cyclotron, a 71.26 MHz scaled-down cavity prototype was designed.