A Brief Introduction to the Study of the Tang Dynasty′s History During the Middle-age of North Song Dynasty

North Song Dynasty was beset with domestic trouble and foreign invasion.Literators and officials felt anxious about the situation even intensely unsatisfied to the The Previous Historical Book about Tang Dynasty,a tide researching on the history of Tang Dynasty had emerged during the middle-age of North Song Dynasty,and therefore,a lot of important historians and historical books had emerged in larged numbers.Honor or condemn,the writing style of The Spring Antumn Annals,had been put through writing.Appraising history in depth,and drawing object lesson from history made those historians and books far-reaching.