Differences: ① In time, Zhaojun's departure from the fortress occurred in the Han Dynasty, and Princess Wencheng's entry into Tibet occurred in the Tang Dynasty. (2) On the kinship groups, Zhaojun's departure from the fortress was a marriage between the Han Dynasty and Xiongnu, and Princess Wencheng's possession was a marriage between the Tang Dynasty and Tubo. (3) In terms of background and purpose, before Zhaojun left the fortress, Han and Xiongnu fought for years, and the purpose of marriage was to end the war and maintain peace; Before Princess Wencheng entered Tibet, the national strength of the Tang Dynasty was strong, and the advanced political system and prosperous social economy made the frontier nationalities yearn for the wind. Songzan Gambu praised the culture of the Central Plains in order to strengthen the friendly relations between the two nationalities. Similarities: Mainly reflected in the significance of two events, Zhaojun and Xiongnu Khan passed on the culture of the Central Plains to Xiongnu, and Xiongnu and Han Dynasty lived in harmony, and there was no war for more than 60 years. After Princess Wencheng entered Tibet, the brotherhood between the two nations was enhanced. Promote political, economic, cultural, artistic, scientific and religious exchanges between the Central Plains and Tibet. She brought grain seeds and planted them widely on the Qinghai-Tibet Plateau. The craftsmen brought in helped the Tibetan people make farm tools, looms and rice mills, and set up handicrafts such as pottery making, wine making, paper making and ink making. Gong brought to teach Tibetan people to spin. Princess Wencheng also encouraged and helped Minister Tomi Sambuza to create Tibetan. Later, she translated many Chinese books into Tibetan, which promoted the cultural exchange between Chinese and Tibetan.