A project on compact Terahertz(THz) Free Electron Laser(FEL) source was performed. A novel thermionic cathode RF gun with two microwave feed-in ports and a main accelerator used for energy booster were developed, and the preliminary power test experiment was executed. This paper introduces the research progress of the project, including physical design, numerical simulation and preliminary power test results of the novel thermionic cathode RF gun and the main accelerator, as well as the experimental results of the wiggler. The measured beam energy is about 6.7 MeV, Energy spread 0.95% and normalized emittance 13.5 πmm?mrad.