田夫《洗脚上岸读历史》《新唐书·食货志》描述贞观之治:“至四年(即贞观四年,630年),米斗四五钱,外户不闭者数月,马牛被野,人行数千里不赍粮。”就是说,贞观四年时社会生产力已得到恢复,社会治安已有明显改观,商业状况也得到最根本的扭转。然而,一个国家的国力如何,还要看局外人的评价,当时的国 Tian Fu “read the history of the foot bath shore,” “New Book of Tang Food” describes the rule of Zhenguanzhi: "to four years (that is, Zhenguan four years, 630 years), rice bucket four or five money, That is, the productive forces in the four years of Zhenguan have been restored, the social order of security has been remarkably improved, and the business conditions have also been most fundamentally reversed. However, a country’s national strength, but also depends on the evaluation of outsiders, then the country