Abstract: The essay is trying to deal with the data of seismic motion of Yunnan over the recent 45 years using frequency spectrum analysis,on basis of earthquake catalogue of Yunnan.The quiet and active period of seismic motion are studied utilizing sequential characteristics of magnitude and energy,and the primary period of seismic motion here is discussed by conversion of time domain and frequency domain,together with historical background of seismic motion of Yunnan.Then the characteristics and future possibilities of seismic motion of Yunnan are investigated.