Abstract:  Based on the Antras et al. (2012) method, this paper uses Inputoutput tables of 30 provinces and autonomous regions of China in 1997,2002, 2007 ,2012 and 2017 to measure the industrial chain length of 17 sub industries at the provincial level, and analyzes the role of service outsourcing in extending the industrial chain length. The empirical results show that: firstly, on the whole, service outsourcing has a significant role in promoting the growth of China's industrial chain. Every 10% increase in service outsourcing can promote the growth of China's industrial chain by 0.62%. Secondly, from the perspective of service outsourcing, transportation and warehousing outsourcing has the greatest effect on the extension of industrial chain. Thirdly, the study of different regions finds that the service outsourcing has the greatest promotion effect on the industrial chain length in the central regions, followed by the western regions and the eastern regions. Fourthly, the study of different industries finds that the service outsourcing has an effect on the length of industrial chain in both the manufacturing industry and the service industry, but the promotion effect on the service industry is nearly 2.7 times of the promotion effect of the manufacturing industry.

Key words: service outsourcing, industrial chain length, upstreamness

摘要： 本文参考Antrs et al（2012）方法，利用中国1997年、2002年、2007年、2012年和2017年投入产出表测度30个省份17个细分行业的产业链长度，并在此基础上分析服务外包对延伸产业链长度的作用。实证结果表明：第一，从整体上看，服务外包对我国产业链长度攀升具有显著促进作用，服务外包每提高10%，可以促进我国产业链长度提升062%。第二，从细分类型的服务外包看，交通仓储外包对产业链长度延伸的促进作用最大。第三，分地区研究发现，服务外包对中部地区产业链长度提升最大，其次是西部地区，东部地区最小。第四，分行业后发现，服务外包对制造业和服务业产业链长度均有提升作用，但是对服务业促进作用是制造业的近2.7倍。

关键词: 服务外包, 产业链长度, 上游度