11.1　Strengths

•Reliable and reliable data,from the world's ozone and ultraviolet radiation data center,the time span.

•The temporal and spatial analysis of the time series of ozone content was carried out to find the characteristics of different angles.The long-term trend and rate of change of the annual global ozone amount were analyzed,which lay a solid foundation for the prediction.

•The variation law of ozone content was analyzed and validated in DHR model.

•The seasonal variation of ozone content was analyzed to provide a reference for prediction.