Abstract: The present trend of anti-seismic design is the utilization of probabilistic method. The result of extremum analysis can satisfy this need. In this paper, the distribution of historical earthquake intensity is studied by using the extremum analysis method, and the possibility of the estimation of earthquake hazard discussed for construction sites by using the data of histo-rical earthquake intensity data. Results indicate that we can get the anti-seismic parameters from the time series of intensity by using extremum analysis in those areas where the records of historical earthquakes are abundant. In practical analysis, it is appropriate to use extremum distribution function modified by Chen peishan and the fitting formula G= (l-0.44)/(n+ 0.12).