The long-period ground motion

which is mainly composed of low-frequency components

can easily cause the damage of medium-and long-period structures. For this kind of special ground motion

the current seismic standard does not have corresponding provisions

and there is few studies on the dynamic response of high-rise structure under long-period two-way horizontal ground motions. In this paper

the dynamic time-history analysis of a 30-story frame shear wall high-rise structure is carried out by using the Perform-3 D finite element software. 10 far-field long-period ground motions

10 near-field long-period ground motions

and 10 ordinary ground motions are selected. Meanwhile

the maximum drift is taken as the engineering demand parameter and Sa（T1

5%） as the seismic intensity index

and four structural performance levels are defined. Based on the incremental dynamic analysis（IDA） method

the structural responses under different seismic intensities as well as the seismic fragility curves are obtained. Finally

the fragility of the three types of ground motion is evaluated and compared.