 This study developed a mathematical model for calculating the transmissibility of SARS-CoV-2 using a bat's hosts reservoir people transmission network model and simplified it as reservoir people RP transmission network model. The results showed that the expected number of secondary infections from introducing a single infected individual into an otherwise susceptible population was 3.58, indicating that SARS-CoV-2 has a higher transmissibility than MERS in the Republic of Korea, but lower than severe acute respiratory syndrome and Middle East respiratory syndrome in the Middle East countries. This article was authored by Tien Mu Chen, Du Rui, Cho Peng Wang, and others.