To improve the voltage quality of distribution network with Distributed Generations (DG) and make the control independent of the communication system, a local control approach of DGs is put forward. According to the voltage of PCC, the active and reactive power of the corresponding DG are regulated to increase or decrease, the regulation is committed repeatedly with the magnitude of control adjusted based on a dichotomy process so as to make the voltage of PCC of the corresponding DG within the restriction of voltage deviation. In the suggested local control process, the regulation of the reactive power based on the residual capacity of the inverter with MPPT is of priority. The active power of a DG is decreased properly when it is necessary. The condition is monitored in real time to increase the active power output of the DG in time so as to utilize the nature resources as much as possible. The IEEE-33 system is used as an example to verify the proposed control method, showing that its feasibility and the voltage quality of the distribution network with distributed generations can be improved effectively.