Abstract: Starting with the composition of distribution line loss,this paper ananlyzes the general causes of high distribution line loss,and briefly discusses the advantages and disadvantages of technical loss reduction means such as wire replacement,distribution,load transfer,reactive power compensation,and voltage regulator.It is found that the cost and conditions of loss reduction means such as wire repalcement,distribution,and load transfer are high.And install reactive power compensation device for auxiliary regulation,less investment,and can achieve better economic benefits.