Abstract: The concurrent commutation failure of line commutated converter high voltage direct current (LCC-HVDC) cannot be avoided, which seriously threatens the safe and stable operation of the power system. Aiming at the receiving-end power system with multi-infeed LCC-HVDC, the impact factors of the recovery process after commutation failure on the transient stability of the receiving-end power system in this paper are theoretically revealed, and a multi-DC collaborative recovery control strategy is further proposed to improve its transient stability. The receiving-end power system model with multi-infeed LCC-HVDC and the DC power flow analysis model is established. Secondly, the analytical expression of the relative rotor angle difference of the receiving-end power system to the DC power during the recovery process is derived theoretically, and the impact factors of the DC recovery process on the rotor angle stability of the receiving-end system are obtained. Next, based on the regulation characteristics of the inverter-side DC controllers, the impact factors of the DC recovery process on the voltage stability of the receiving-end system are obtained, and a collaborative multi-DC recovery control strategy is further proposed based on the above impact factors. Finally, the improved Kundur's two-area system and IEEE-68 bus electromechanical-electromagnetic hybrid simulation system are built, and the correctness and effectiveness of the proposed impact factors and collaborative recovery strategy are verified by simulation results.