Abstract: Firstly, this article use the data of CASIF and CCTS in 2000-2006, estimates the extent of Chinese enterprises to participate in the East Asian vertical specialization, the study results showed: 2000 - 2006 China's participation in East Asian vertical specialization degrees presents a rising trend, and this upward trend showed more inter-industry effects. On this basis, the paper estimated the spillover effect of enterprises to participate in the East Asian vertical specialization to firm productivity, results showed that: (1) Overall, the enterprises to participate in the East Asian vertical specialization TFP enterprises have a significant role in promoting firm productivity; (2) trade type、ownership type and industry feature are important factors of affect the productivity spillover of vertical specialization.