From amusement,vehement aspiration to sad melody——A diachronic study on Song poems written after ascending high buildings

The poems written after ascending high buildings in the Song Dynasty reflect three periods of changes.The first is in the Northern Song Dynasty,during which the authors were a group of gentlemen whose poems mainly described their tours and joys;the second is from the moving of the Northern Song to the middle and late Southern Song,during which the authors were a group of men of ideals and integrity whose poems mainly described their vehement aspirations and worries for recovering the lost nation lands;the third is in the last period of the Southern Song Dynasty and the beginning of the Yuan Dynasty,during which the authors were a group of hermits whose poems mainly described their sorrows of the subjugated nation.