中文摘要：

5·12汶川地震摧毁了北川县城——曲山镇。为了促进全国唯一的羌族自治县在灾后恢复与快速发展，县城异地重建是必然的选择。在各级政府、相关部门的前期工作基础上，北川新县城已有5个备选场址，即擂鼓镇场址、永安镇场址、安昌镇场址、桑枣镇场址和板凳桥场址等。在此，分别从地质条件、地貌条件、5·12地震反应、社会影响和民族关系等方面，比较了5处备选重建场址的优势和劣势。虽然永安镇场址在各方面的优势均处于中等或中等偏上，但最后综合考虑，建议选择安县永安镇场址作为北川新县城场址。

英文摘要：

The seat of Beichuan County was left a ruin by the devastating ＂5 · 12＂ earthquake. The new site choice is urgent for rebuilding the only Qiang Autonomy County of China. Five sites are under consideration： Leigu, Yong＇ an, Anchang, Sangzao, and Bandengqiao towns. This paper makes comparisons among these sites in the following conditions： geology, geomorphology, Wenchuan quake effect, and society. There is a land about 7 km^2 in Yong＇an site which may be sufficient to rebuild the new county. Yong＇ an is located between the two faults of Longmen Shan, and is geologically safe. The brick-reinforced concrete buildings and the framework buildings basically are still in good condition after the quake. The location of Yong＇ an in mountain area favors in conserving and protecting the ethnic characters of Qiang; and the cost of water supplies is relatively lower. But it is inferior in attracting invests because of its difficulties in accessibility. The hazards and too small to erect a new county; Anchang site is Leigu site, on the other hand, is in high risk of geoalso small and suffers difficulties in reconstruction of the old town. The Sangzao site bordering the mountains is inappropriate for ethnic protection. The Bandengqiao site is far away from mountains and adverse to the purpose of protecting ethnic characters. In conclusion, the Yong＇ an Town of Anxian County is the best one for the reconstruction.