Based on the Xinjiang Power Grid Planning grid structure in 2017, Zhundong-Chongqing ± 1100kV HVDC will serve as the second delivery channel DC second access to the Xinjiang sending-end grid. In order to guarantying the security and stability of the Xinjiang sending-end grid, When Hazheng ± 800kV DC blocking fault, put forward considering the ± 1100kV emergency DC power supply, the sending-end grid of thermal power , analysis of different stability control measures of influence for containing double DC voltage of the sending-end grid. The paper results illustrate that under the premise of stable operation of Xinjiang sending-end grid, the steady control and DC power supply can effectively reduce the power cut of the power supply network, and balance the reactive power after DC fault. The stability control measures have certain reference value to improve the voltage stability of the Double DC sending-end grid and to optimize the control of the unbalance cutting power.