It is an important problem to effectively process and analyze power data with the increasingly active power trading markets across the country and the increasingly abundant types and quantities of power trading. Firstly

this paper analyzes all kinds of index preparation methods and their application in domestic and foreign markets

and presents the index of Beijing Electric Power Exchange Center(referred to as electric power index)which reflects the change of the electric power market transaction structure and quantity of electricity market participants to provide the reference and guidance to the market. Then

by referring to the guidance and instruction effect of Dow Jones theory and other market composite index theories in the securities market

the calculation and analysis method of the power market composite index is presented. It also explains how to analyze the characteristics of total electricity trading volume

seasonal fluctuation

regional difference and transaction type difference with the electric power index. The five factors influencing the electric power market composite index are investigated

including the total electricity consumption

market liberalization ratio

market trading price

trading varieties and market access area. Finally

the calculation formula of the electric power index is used to analyze the power market data from 2016 to 2017

and the results prove that the electric power index can accurately reflect the trade in the power exchange market.