Abstract: Terahertz (THz) technology is anticipated to be crucial to spacecraft capsule weight reduction and the requirement for high-capacity transmission inside the capsule. In the millimeter-wave 60 GHz and terahertz 300 GHz bands, the typical spacecraft cabin channel is modelled in three dimensions in this article. Using the ray-tracing technique, the radio channel characteristics of the deployment places of the two representative transmitters are determined. It was looked into how the channel in a particular frequency band cabin would change depending on where the transmitter would be deployed. The results demonstrated that, in the same environment, the higher the frequency is, the higher the path loss and the Rice factor K are and the lower the delay expansion is. At the same frequency, the channel characteristics are better when the transmitter is placed in the corner in the cabin as opposed to its upper-wall center. The radio channel characteristics examined in this research will provide ideas for how terahertz communication systems will be designed and implemented in complicated cabin environments in the future.