Abstract: To address the lack of a systematic design method for the main installed parameters of a dual-mode TBM cutterhead under complex geological conditions such as alternating soft and hard rocks, low surrounding rock classification grades, and developed groundwater, this paper proposes a design method for the main installed parameters applicable to an earth pressure balance/single-shield dual-mode TBM.Separate calculation models for cutterhead thrust and torque were established for the earth pressure balance mode and the single-shield mode.In the earth pressure balance mode, seven torque components were considered, including front/back friction, side friction, and cutting resistance.Five thrust components were also taken into account.In the single-shield mode, two operating conditions were distinguished: normal excavation and jamming release.The thrust and torque required for rock breaking were calculated separately for each condition.The influence of surrounding rock pressure on jamming release was considered.Lot 10 of the TBM water conveyance tunnel in the Yangtze-to-Hanjiang River Water Diversion Project was used as an example.In the earth pressure balance mode, the required rated torque was no less than 30 961 kN·m, and the maximum required thrust was no less than 125 983 kN.The actual installed parameters of the dual-mode TBM were determined through comprehensive design.The cutterhead rated torque was 32 667 kN·m, and the system maximum thrust was 159 042 kN.Both values exceed the calculated requirements.The proposed design method for main installed parameters of a dual-mode TBM cutterhead can provide a reference for selecting and determining installed parameters of earth pressure balance/single-shield dual-mode TBMs in complex geological environments.