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This paper analyzes the effect of ±800 kV Yun-Guang ultra HVDC transmission system, which operates respectively in the interconnection and island modes, on the voltage profile of the receiving-end Guangdong Power Grid during normal operation and after single-polar/bipolar blocked faults. Countermeasures are presented in terms of normal voltage control, coordination of three lines of defense and collocation of dynamic reactive-power compensation and so on. Also, some suggestions of reinforcing demand side management are proposed to solve the problem of under voltage load tripping (UVLT). This work is important for Guangdong Power Grid's receiving power from Yun-Guang ultra HVDC transmission system safely and the successful implementation of the Chinese west-to-east power transmission policy.