中文摘要：

专业化与地理集中的理论研究主要来源于贸易理论和区位理论，利用专业化与地理集中指数可以衡量其地方的专业化和产业的地理集中度。以京津冀地区为例进行的实证研究，得出以下结论：天津、河北地区2间专业化指数逐年上升，而北京、天津两地的专业化指数则一直处于较低水平。制造业在1993—2004年间，20个行业中有14个行业的地理集中指数呈现大幅度上升，5个行业的指数呈现下降的趋势。在此基础上，需提出促进京津冀区域产业发展和地区分工及一体化的政策建议。

英文摘要：

Theoretical explorations into specialization and geographic concentration originated from the theories of trade and location. Using Location Quotient, Krugman regional specialization index and Elison-Glaeser index, we study the regional specialization and geographic concentration of twenty manufacturing industries in Beijing, Tianjin and Hebei. We find that the specialization index between Tianjin and Hebei increased year by year, but this index between Beijing and Tianjin remained low. The Elison-Glaeser Index of 14 out of the 20 manufacturing industries in question rose tremendously with only 5 industries dowel during the period of 1993-2004. It is argued that these findings can inform the policy-making decisions to promote industrial development and regional specialization and integration in the three regions concerned.