Abstract: The statistical data of four charging pile data collection platforms in Tianjin are given. The data show that the electric quantity distribution of the charging pile has long tail characteristics and power law characteristics of global and local self similarity. It is concluded that a few charging piles at the tail are extremely important and few charging piles at the head are paid attention to. The paper puts forward some suggestions that the distribution of measurement resources should focus on the tail and leave the head,and encourage diversified small-scale technology attempts and mode innovation by taking advantage of the low cost of trial and error at the head.

Key words: charging pile, metrology, verification, power law distribution, long-tailed distribution