中文摘要：

县域经济转型升级和产业结构优化是我国经济转型升级的基础性工程。探索具有县域个性、竞争优势特色和区位条件的转型升级战略，有重要的实践价值。基于临港型战略新兴产业成长机制视角，剖析县域转型升级和产业结构优化的制约因素，提出县域经济发展转型升级路径，为我国县域经济转型升级提供重要决策参考。

英文摘要：

The county economic transit and upgrading is the foundational project for economic transit and upgrading in China, therefore it is of important practical value to explore the transit and upgrading strategy with county individuality, competitiveness and lo- cational conditions. The paper is based on the perspective of the growing mechanism of strategic emerging industry nearby the port, makes an analysis on the restriction factors for the county transit and upgrading and industrial structure optimization, and proposes the transit and upgrading way for the county economic development, which is the important reference for the decision-making of the country economic transit and upgrading.