Analysed the features of earthquake interval pattern in some regions and their relation to seismic trends.Before the 1960s,the whole world had gone through a seismicity period,the earthquake intervals kept stable and uniform distribution basically,then,weakened and changed to quiety.The chief characteristics are higher values,increased situation remarkably,scattered pattern and existence in groups outstandingly.The higher values of intervals for global and larger regions have inermission vantage of near 20 years.A seismicity may be taken as a ‘window’ of seismic situation of higher grade seismieity.Finally,the seismic trends in the future years are discussed.