The AC voltage is very sensitive to the change of reactive power in weak AC systems. If the both control of STATCOM and HVDC in the converter station is not coordinated properly, too fast recovery of DC power after the failure will lead to serious issues such as reactive power imbalance, voltage distortion, repeated commutation failures, which will have a great impact on the stable operation of HVDC. The paper analyzes the problems of HVDC recovery after the failure of weak AC system, proposes a comprehensive optimization method of VDCOL for STATCOM and HVDC system, builds a RTDS simulation model for joint operation of STATCOM and HVDC， and carries out simulation and field experiment verification. The results show that the proposed optimization method can limit the DC current overshoot, reduce the reactive power consumption. Meanwhile the appropriate extension of DC recovery time and the effective cooperation of STATCOM are beneficial for AC voltage recovery and reduce subsequent commutation failures, and have a significant effect on improving DC stable operation in the weak receiving-end.