Abstract: AC/DC delivery of integrated wind-thermal power will be an important form of transmission in the future in China. The volatility of wind power output and the AC/DC hybrid transmission mode bring a new challenge to the calculation of the inter-regional total transfer capacity (TTC). Firstly, a system model is established for delivery of the integrated wind-thermal power into the same receiving-end area through the AC/DC transmission channel. Considering the problem of system reactive power adequacy, a TTC calculation model is established based on the improved continuous power flow algorithm, and the single sample value is quickly acquired. Then, considering the inherent volatility of wind power and various uncertain factors in the system, the non-sequential Monte Carlo simulation method is used to evaluate the inter-regional TTC, and the result is verified by case study. It is found that the AC/DC hybrid transmission mode can improve the regional TTC of the system, and the inter-regional TTC can be improved by increasing the proportion of integrated wind-thermal power within a reasonable range. However, when the proportion of wind-thermal power is too high, only the existing grid structure is upgraded and the transmission capacity of the transmission lines is improved, can the system's TTC level be further increased.