With the transformation from the writer to intellectual was finished, scholars of the Middle and Late Period of Tang Dynasty had the culture characteristic of having a good command of history and literature. The characteristic made it was possible that history spirit can influence the History Discussing Style. Making a concrete analysis, we found that traditional spirit using history warning and affecting reality was very mature during the initial stage of Tang Dynasty, but its popularity emerged during the Middle and Late Period. Under the influence of the spirit, the History Discussing Style concentrated on warning monarch and affecting reality, therefore had strong criticism and pertinence. Since the ChunQiu school, the spirit which discarded the old classics ideas and brought forth new ones made scholars double traditional connotations of scripture and history, discriminate history facts carefully and advocate new ideas, therefore the FanAn style emerged. Adapting to the demand of building new thought system, historiography in the period opened the learning of righteousness and principle, advocated the study of heart world and changed the criterion of choosing ancient into history. Under the influence of the spirit, the History Discussing Style paid attention to clarify morals which hidden in history, had the nature of Confucian righteousness and principle; thought problems from the angle of heart-nature; caused the poetry atmosphere of praising the moral, loyal or hermitic figures.