For a long time

the classification of species depends mainly on morphologic methods.And it is difficult to realize automatic species classification by using computer.This article puts forward a alignment-free sequence comparison method based on whole genomes and draws phylogeny trees for 9 Hepadnaviridae viruses and 14 Caulimoviridae viruses with this method.The results match the standard of virus classification published by ICNV.On this foundation

the article exploringly puts forward an automatic classification method of species based on pattern recognition and uses this method to do the automatic classification for Hepadnaviridae viruses and Caulimoviridae viruses.The correct classification rate reaches 100% and 94% respectively.