The world is in an era of major changes of accelerated transition from an industrial economy to a digital economy.However，our metrics cannot keep pace with its development yet.How to precisely measure digital economy and its effects on the overall economy becomes a chief challenge.This article comprehensively introduces the major international digital economy measurement methods，explains the construction principles and focuses of digital economic evaluation，analyzes the policy of promoting the development of digital economy，and summarizes the enlightenment and reference for quantitative evaluation of China's digital economy.