The natural equivalent resistance of the DC yard equipment in hybrid multi-terminal HVDC (H-MTDC) system is small, so it is easy to cause resonance oscillation at the DC side of the system when the control system can't provide sufficient damping. This paper firstly deduces the DC-side output impedances of line commuted converter (LCC) and modular multilevel converter (MMC) stations. The impedance model of H-MTDC system is established in MATLAB and the stability criterion based on loop gain is given. Secondly, by quantitative analysis of the frequency domain sensitivity of controller parameters through calculating loop gain, their effect on loop gain curve has been quantitatively analyzed. The dominant factors affecting the resonance characteristics of the system are clarified, and a parameter adjustment scheme is formulated combining stability criteria. Thirdly, by feeding back the DC current from the converter station, the original constant current controller of LCC station is improved to a current damping controller and its parameters are designed. Finally, the effectiveness of the resonance suppression strategies are verified by time domain simulation in PSCAD/EMTDC.