Abstract: Existing studies rarely evaluate the carbon emission effect of digital economy scientifically and quantitatively from the perspective of the whole industry chain,and most of them analyze the impact of digital economy on regional carbon emission through the ICT industry.This paper calculates the carbon emission effect of digital economy in Hebei from the perspective of whole industry chain by constructing digital economy input-output model.The research results show that the total carbon emission of the whole industrial chain of digital economy in Hebei is second only to the six energy-intensive industries and transportation industry,which is mainly driven by trade and consumption,concentrated in the high energy consumption sectors in upstream of the industrial chain and the high-digital sectors in downstream of the industrial chain.The domestic trade and residents consumption are the main driving forces for the increase of carbon emission of digital economy in Hebei,and the carbon intensity and industry association are the dominant factors to reduce carbon emissions.Finally,the paper puts forward corresponding countermeasures and suggestions from macro and micro levels to promote scientific emission reduction of digital economy.

Key words: the whole industry chain, digital economy, carbon emission, structural path analysis(SPA), structural decomposition analysis(SDA)