Abstract: In view of the increasing factors of power demand in our country，and the low efficiency of traditional

static model and adjustment mode of distribution network based on artificial experience，which can not meet the

practical needs of high-level applications such as refined line loss of distribution network. It was proposed to take a

certain station area in Bameng as a pilot，and build 10 kV feeder line loss model，substation area line loss model and substation area branch line loss model through load data and remote signaling data extracted from cross platform massive data.A line loss refinement system with automatic topology check technology was debeloped to visualize the line loss index. By comparing the 10 kV line loss between the traditional method and the proposed method，it was concluded that the proposed method has advantages to a certain extent.

      Key words: distribution network；fine line loss；modeling；data visualization