中国海关数据库进出口数据显示，自中国加入WTO以来，企业对外出口总额从2001年的2665亿美元增长到2011年的18954亿美元，出口贸易发展迅速。从出口主体来看，内资企业的出口总额虽低于外资企业，但却对地区增长起着更重要的作用。而由于出口前景不确定性的存在，多数企业在开拓新出口市场时不可避免地需要付出高昂的试错成本，成功建立新出口联系的效率也大大降低。基于这种问题的存在，本文试图研究其他企业的出口行为是否会对内资企业潜在的相同出口行为产生影响，从而降低企业探索新出口的沉没成本，实现新出口市场的有效进入。 使用中国海关库2001-2011年企业层面的进出口数据汇总，借助条件逻辑回归模型研究地级市尺度上外部联系对内资企业新出口市场开拓的溢出效应。本文在研究中引入了对外部联系的分类，分别探讨1）本地外资企业出口；2）邻近城市企业出口；3）本地企业进口；对内资企业新出口联系产生的影响。回归结果表明：三种外部联系对内资企业开拓新出口市场均表现出积极影响，其中本地外资企业出口的溢出效应最大，邻近城市企业出口次之，本地企业进口的溢出效应最小。进一步划分内资企业所在城市发现，中西部地区与东北地区邻近城市企业的出口溢出贡献最大，且三种外部联系溢出效应均明显强于东部地区，这为中西部地区与东北地区企业探索新出口联系提供了一定的参考价值。

The import and export data of the China Customs database at the enterprise level shows that since China’s accession to the WTO, the total export volume of enterprises has increased from US$266.5 billion in 2001 to US$1895.4 billion in 2011. Export trade has developed rapidly. From the perspective of exporters, the total export value of domestic-funded enterprises is lower than that of foreign-funded enterprises, but it plays a more important role in regional growth. Due to the uncertainty of the export prospects, most enterprises inevitably need to pay high trial and error costs when opening up new export markets, and the efficiency of successfully establishing new export links is greatly reduced. Based on the existence of this problem, this paper attempts to study whether the export behavior of other enterprises will have an impact on the potential export behavior of domestic enterprises, thereby reducing the sunk cost of exploring new exports and realizing the effective entry of new export markets. Using the China Customs Database's 2001-2011 enterprise-level import and export data to summarize, using the conditional logistic regression model to study the spillover effects of external linkages at the prefecture-level market scale on the new export market development of domestic-funded enterprises. In this paper, the classification of external contacts is introduced in the study, which respectively discusses the impact of 1) the export of local foreign-funded enterprises; 2) the export of nearby urban enterprises; and 3) the import of local enterprises on new export links of domestic-funded enterprises. The regression results show that the three kinds of external linkages all have positive effects on the development of new export markets by domestic enterprises. The spillover effect of domestic foreign-invested enterprises is the largest, followed by urban enterprises, and the leakage effect of local enterprises is the smallest. Further dividing the cities where domestic enterprises are located found that the export spillovers of the neighboring urban enterprises in the central and western regions and the northeast region contributed the most, and the three external linkage spillover effects were significantly stronger than those in the eastern region. This provides a certain reference value for enterprises in the central and western regions and enterprises in the Northeast to explore new export linkages.