After the Wenchuan M8.0 extraordinary earthquake occurred in Sichuan province on May 12

lots of digital strong motion records are gained by the China Digital Strong Motion Seismograph Network.The records

especially far-field records

provide ample ground motion component of long period structures.According to the digital strong motion records of several South-East provinces

the characteristics of far-field ground motion of the Wenchuan M8.0 extraordinary earthquake are analyzed

and the long-period ground motion characteristics of deep and soft soil sites and rock sites and their differences are researched.Based on the characteristics of the long-period structures

the seismic response analysis of structure is carried out using the super-long seismic records of the A050 strong ground motion station

which was built on the site with deep and soft soil layers.The effects of far-field ground motion on long-periodic structures during Wenchuan M8.0 extraordinary earthquake are researched

and some noticeable and thoughtful issues in earthquake resistance of long-period structures and earthquake safety countermeasures are put forward according to the actual characteristics of earthquake disasters.