Songzan Gambu and Princess Wencheng's Copywriting

According to legend, Princess Wencheng bid farewell to her parents and left Chang 'an. After crossing mountains and mountains, she came to the desert plateau. As she gets farther and farther away from her relatives and hometown, she can't help thinking of her parents in Chang 'an. She remembered what her mother said when she gave her a precious mirror when she left: If you miss your relatives, you can see your mother in the precious mirror. So he quickly took out the "Mirror of the Sun and Moon" and held it in his hand. If he didn't take it, he was surprised. It turned out that Princess Wencheng didn't see her mother in the mirror, but she looked haggard and sad. When she was angry, she dropped the mirror on the ground. Unexpectedly, as soon as Bao Jing landed, it immediately became a high mountain-later called Sun Moon Mountain. It just blocked an eastbound road leading to the river, and the river had to turn around and return. So people call this river the Daotang River. Sun Moon Mountain and Daotang River are just beside the Qinghai-Tibet Highway near Xining, Qinghai Province. According to "The King of Tibet", Princess Wencheng entered Tibet with "Buddha statues, treasures, jade bookcases, 360 volumes of classics and various jade ornaments of Sakyamuni". There are also a wide variety of cooking foods, brocade quilts with different patterns, 300 divination classics, 60 books on distinguishing good from evil, architecture and technology, 100 therapeutic prescriptions, 4 medical works, 5 diagnostic methods and 6 medical devices. It also carries all kinds of grains and turnip seeds.

It is a year's journey from Chang 'an to Tibet through Longnan and Qinghai, and there are several fast-flowing rivers along the way. In the dead of winter, the river is gentle, which is convenient for the farewell party. The team also carries books, musical instruments, silk and grain; In addition to Princess Wencheng's maid-in-waiting, there are a group of people, musicians and agricultural technicians, almost like a "cultural visiting group" and an "agricultural team". After more than a month's arduous trek, facing the snow and snow, Princess Wencheng and her party arrived at Heyuan, the birthplace of the Yellow River, during the warm spring in bloom. Here, lush water plants and flocks of cattle and sheep have changed the desolate scene of sandstorms along the way, which makes people relaxed and happy. Princess Wencheng, who was worried about the poor terrain of Tubo along the way, was relieved at this moment, so the farewell party took a short rest here for a few days.