Abstract: Based on the micro-data of Chinese enterprises, this paper constructs a theoretical model including enterprise heterogeneity, import intermediate input and export domestic value-added rate(DVAR), analyses the mechanism of the effect of trade liberalization of intermediate inputs on enterprises′ export domestic value-added rate,and examines the impact of intermediary trade liberalization on Chinese enterprises′ DVAR by measuring the input tariffs and DVAR of intermediaries at enterprise level.After considering the related endogenous problems, the empirical results show that trade liberalization of intermediate inputs is beneficial to the improvement of DVAR of Chinese enterprises, and the impact of trade liberalization of intermediate products on DVAR of enterprises of different regions and ownership types is different. The conclusion of this paper provides a new perspective for re-understanding the liberalization of intermediate trade from the perspective of domestic added value of enterprises′exports.

Key words: enterprise heterogeneity, trade liberalization, domestic value added