Li Shimin should be regarded as an emperor through the ages. According to historical records, Li Shimin's strategy of governing the country is very high, and the rule of chastity is very famous. Li Shimin also wrote a book "Emperor Fan" to guide and teach the later emperors, which reflected his thoughts of governing the country. Li Shimin's personality was set up as a model for China emperors. Li Shimin's thought is ok, and his famous words, whether in quantity, quality or influence, occupy the first place among the emperors in China.