This paper focuses on the problem that the voltage exceeds the limit range when Distributed Generation (DG) is connected to distribution network. Reactive power of DG inverter can offer reactive support to solve the voltage problem. The reactive voltage control strategy based on adaptive autonomous segment for Distribution Network with Sources (DNS) is put forward in this paper. Firstly, this strategy can adaptively adjust the trigger voltage thresholds by collecting the information about the voltage of Point of Common Coupling (PCC) of DG and the direction of active power flow through next feeder adjoining the PCC of DG. Then, the threshold value of trigger voltage is adjusted dynamically according to the collected information. The run value of the PCC of DG can be divided to five intervals by the trigger voltage thresholds. Secondly, according to the interval that the voltage of PCC of DG is in the reference values about reactive power outputs of DG inverter can be calculated by using the Q(U) control method. Finally, the reactive output of the DG inverter is controlled to trace the reference value. This research is comprehensively compared with the case without the reactive support of DG inverter and the case where DG inverter operates using the Q(U) control strategy with constant segmented voltage threshold. The simulation result shows that the proposed method has a significant improvement on reducing the voltage exceeding the limits range, restraining the voltage disturbance and improving the voltage quality. This work is supported by Guangdong Power Grid Co., Ltd. Science and Technology Project (No. GDKJXM20162615) and National Natural Science Foundation of China (No. 51777077).