In this paper

the reactive power optimization of power distribution grid including distributed generators（DGs）is taken as the study subject. The distributed power supply is integrated into the reactive power compensation of the distribution grid on the basis of traditional voltage regulation method

which

at the time of improving the level of system voltage

also reduces the network loss effectively. The basic bacterial colony chemotaxis（BCC）is modified

differential evolution operator and linear power function mixed mapping chaos model are introduced into the calculation so to achieve self-adaption adjustment of the sensing range and movement speed of the bacteria and the whole searching ability and calculation speed are improved. Finally

the effectiveness of the calculation method and the necessity to integrate the distributed power supply into the reactive power compensation is verified by the example.