Canvass on the Sorrow of "Four Grief" in Xu Hun's Poem

Xu Hun is one of the best poets in the end of the Tang dynasty ,and outstanding in his poems on the faction of hidden in landscape,his poem is full of the sound of grief and sorrow about the society,the reason is that:on the one hand,his experience of frustration of life has to let him believe and undstand buddhism,especially have a deeply understanding on the sorrow of Four Grief,on the other hand,his deeply understanding on buddhism let him feel more about the society and life.This article discusses the sorrow of Four Grief --living? aging? illness and death of the times? society and the exprience of the author.