Abstract: In order to evaluate the voltage interaction characteristics between the converter stations of the hybrid multi-infeed high voltage direct current (HMIDC) system, this paper proposes a multi-infeed interaction factor (MIIF) calculation method of the HMIDC system considering DC control characteristics. Firstly, based on the power network equations, a DC additional equivalent operating admittance matrix is constructed that characterizes the control response characteristics of direct current system under small disturbance conditions. Secondly, the DC additional equivalent operating admittances of different control modes of VSC-HVDC and LCC-HVDC are respectively deduced, and the calculation method of the DC additional equivalent operating admittance matrix is proposed. Thirdly, the equivalent nodal impedance matrix is obtained by modifying the AC system nodal admittance matrix with the DC additional equivalent operational admittance matrix. On this basis, a MIIF calculation method of the HMIDC system based on the equivalent node impedance ratio is proposed. Finally, the effectiveness of the MIIF calculation method of the HMIDC system considering DC control characteristics is verified in a hybrid dual-infeed high voltage direct current system constructed in PSCAD/EMTDC, and the influence of reactive power generated by VSC-HVDC and AC system equivalent impedance on MIIF is analyzed.