Abstract: Based on the intermediate perspective, this paper studies the theoretical influencing mechanism from technological innovation, industrial structure and environmental decentralization. Then this paper estimates the threshold effects and spatial spillover effects of environmental regulation on regional carbon productivity based on the panel data of 30 provinces in China from 2008 to 2015. The empirical conclusion shows that, the regional carbon productivity effects of environmental regulation has a structural change with the changes of local technological innovation level, industrial structure deviation and environmental decentralization under the local governmental competition. In other words, under the different technical innovation levels,industrial structures and levels of environmental decentralization,the net effect of environmental regulation on regional carbon productivity shows a ′V′ type,inverted ′V′ type and inverted ′V′ type threshold characteristic respectively;both environmental regulation and regional carbon productivity in adjacent areas have spatial characteristics of local aggregation, which shows obvious positive spillover effect.In order to realize the target of emission reduction commitment, we should promote the practical effects of the environmental regulation on the regional carbon productivity from technological innovation, industrial structure adjustment, environmental decentralization and regional coordination, except for setting the suitable pattern and strength of environmental regulation.

Key words: environmental regulation, carbon productivity, threshold characteristic, spatial Dubin model