During the Zhenguan period, Songzan Gambu sent envoys to propose to Tang many times. Emperor Taizong married Princess Wencheng to him. Princess Wencheng entered Tubo, bringing a large number of handicrafts, various production technologies and medical books, which greatly promoted the economic and cultural development of Tubo. From then on, Tang Fan married very well. For nearly 200 years, when Sinzamp ascended the throne, he asked Tang to "register his life". 1, meaning ① The friendly relations between the Han and Tibetan nationalities have been developed and strengthened. ② Promoted the development of Tubo economy. (3) Sino-Tibetan cultural exchanges have been strengthened. 2. Brief introduction of Princess Wencheng, a distant branch of the royal family in the Tang Dynasty, Han nationality, whose Chinese name is unknown, was honored as Jiamusa in Tubo, the pro-princess of the Tang Dynasty, and the Queen of Zapson Zapa in Tubo. Originally the royal daughter of a distant branch of the Tang Dynasty, she was ordered by Emperor Taizong and pro-Tubo in 640. From then on, Tang Fan married very well. For nearly 200 years, when Sinzamp ascended the throne, he asked Tang to "register his life". 3. Background In the eighth year of Zhenguan in the Tang Dynasty (634), Songzan Gambu sent envoys to the Tang Dynasty, and Emperor Taizong sent pedestrians Feng Dexia to Tubo. Songzan Gambu learned that both Turks and Tuguhun had married the princess of the Tang Dynasty, so he sent people to the Tang Dynasty again and proposed to marry the princess of the Tang Dynasty, which was rejected by Emperor Taizong. King Tuyuhun entered the Tang Dynasty, and the Tibetan envoy told Songzan Gambu when he came back, claiming that the Tang Dynasty refused to get engaged because King Tuyuhun was in the way. In 638, Songzan Gambu used Tuguhun as an excuse to get in the way, sent troops to defeat Tuguhun, Tangut and Bai Lanqiang, and pushed Songzhou (now Songpan, Sichuan) in the Tang Dynasty, threatening to lead a large-scale invasion of the Tang Dynasty if he didn't kiss. Niu Jin led the Tang Jun vanguard to defeat the Tubo army, and Songzan Gambu was afraid. Before the arrival of Tang Jun's main force, Songzan Gambu withdrew from Tuyuhun, Tangut and Blanchard, sent a letter of apology and invited her to get married again. He boasted that Xue Ludong had brought 5,200 gold and the same amount of other treasures as a formal betrothal gift.