Site response characteristic is one of the most important influencing factors of the earthquake motion distribution. It makes an important sense of setting down quake-proof countermeasure and doing the antiknock designing of the construct that to grasp the site response characteristics of the urban area. 场地动特性是影响地震动时空分布的最为主要的因素之一,把握城市地区的地震动特性对于科学地制定城市抗震防灾对策和土木建筑的抗震设计具有十分重要的意义。