For the improvement of voltage quality of the grid

maximum development of economic efficien-cy of the power equipment and reduction of power loss on the power line

such control variables as termi-nal voltage of generator of power system

the tapping position of transformer and the compensation capaci-ty of the reactive power compensator are controlled by the use of shuffled frog leaping algorithm（SFLA inshort）. SFLA is a new kind of intelligent searching algorithm with such advantages as simple definition

less parameter setting

strong search capability and fast convergence

etc. In this paper

the iterative cal-culation and the writing of power flow calculation program of power system is performed by the algorithmto calculate the system’s minimal grid loss and its corresponding variables. Some shortcoming of the algo-rithm is modified and

finally the algorithm before and after improvement is used in the IEEE-30 andIEEE-57 node system

and it is compared with the optimization result of other artificial intelligent algo-rithm. It is shown by the data that the shuffled frog leaping algorithm has good convergence and fast speedand

it also shows its superiority in the reactive power optimization of the power system and the correct-ness as well as excellence of the improved algorithm.