Abstract: ‍ ‍Creating a lunar base is an important task for lunar exploration missions. To meet the high-speed data transmission requirements for obtaining high-definition videos and scientific data from the lunar base， as well as the communication needs of equipment such as space suits and lunar rovers， including high-capacity data rates， it is necessary to make full use of the spectrum resources in the terahertz frequency band. These are relatively abundant and can provide a larger bandwidth and faster communication rates. This study used the channel modeling method to simulate and analyze the terahertz frequency band channel characteristics in the LUNA lunar-base scenario. Evaluating the channel characteristics provided a performance evaluation of the link and other aspects， which can be utilized in the future design of the lunar-base communication system. First， a detailed study was conducted on the construction of the working and living modules for the LUNA lunar base. A multiray channel model suitable for short-range communication scenarios in the lunar base was established by using a hybrid modeling method that included ray tracing and a single edge diffraction model. Finally， a channel capacity model that was suitable for this scenario was derived. Second， the LUNA Hall working module and FLEXHab residence module of the LUNA lunar base were modeled， and a channel simulation was performed with the help of the terahertz channel simulator CloudRT. The characteristics of large- and small-scale fading were analyzed. Finally， two different allocation methods， water injection power and equal power allocation， were used to estimate the channel capacity. The proposed channel model could be used to evaluate the performance of the lunar-base communication system in the terahertz band， and provide a theoretical basis and reference for the construction of the lunar-base communication system.