Analyze the purpose of Songzan Gambu's choice of the capital, and what are the factors that affect the location of the capital?

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In 633 A.D., on a sunny summer day, the young Zagambo led his courtiers and guards, mounted the majestic steeds, set out from the sturdy Bahrain Palace in Kazumagou, Mozhugong, and flew in the direction of Lhasa like clouds blown by the wind. Horseshoe slaps the hard earth along the Lhasa River, making a loud noise like shaking the earth, just like beating the drum of victory. At that time, Lhasa River was not called Lhasa River, but Jiqu River, which means waves of joy and happiness. Lhasa is not called Lhasa, but Xue Ji Wotang, which means Milk Dam in the lower reaches of Jiqu River. At that time, Jixuewotang was just a barren land with few people and few wild animals. Songtsan Gambu spent three days and two days in Jixuewotang, whether marching to fight or with the IPU. Sometimes in Yuan Ye, horses gallop and shoot bison, snow leopards and bear deer; Sometimes jump into the clear waves of Jiqu River and swim in the river; Sometimes I climb to the top of the steep red mountain and stare at the magnificent scenery of Jiqu Valley with misty clouds and rolling snow-capped mountains for a long time. Surrounded by mountains in the north and south, it is rich in aquatic plants and has a mild climate. There are basins suitable for human habitation and dozens of miles of Fiona Fang. The Jiqu River flows from east to west, providing an endless source of water. There are Hongshan, Tieshan and Mopanshan on the Hebei coast. Three rock bees rose from the ground, spread their wings like eagles, jumped like lions, and were like three natural fortresses. Moreover, the transportation is convenient and the geography is moderate. It is adjacent to Datang in the east, Persia in the west and India and Nepal in the south. Songzan Gambu has long taken a fancy to this land and water, and intends to establish a permanent king city here after unifying the snowy plateau. On this day, he led his officials and subordinates to Xue Ji, just to realize his long-cherished wish. Gamagou is not too far from Jixue Wotang, and the fast horse is only less than a day's journey. In the evening, they arrived at their destination, and the monarch and his subjects camped at the foot of the red mountain. The next morning, the king of Tibet led several ministers to visit Wotang in person. He found that where Jinna Township is located today, Jiqu River is divided into two rivers, north and south, which flow freely in Ye Ping, turning many places into swamps and floodplains. He ordered his ministers to gather the surrounding soldiers and civilians, build dams and block the rivers in the north. The mainstream of Jiqu River flows along the southern hillside, making most of the northern part a dry and flat land, on which the later Lhasa City was built. He also found that both the Jixuewo Tangbazi and the ravines on the north and south sides are fertile fields and excellent pastures, so he ordered several nobles such as her family to move some slave owners here to reclaim land and graze cattle, sheep and horses. Now Niangniang Township in the northern suburb of Lhasa is the place where the aristocratic empress immigrated and settled. This name has been preserved since the time of Songzan Gambu. After careful investigation, careful planning, water conservancy construction and resettlement by Tibetan monarchs and ministers, the construction of Lhasa city began to be vigorous. Note: "pull" is the meaning of God; "Sa" means land. Lhasa: It means a place where there are gods and buddhas. It was named after Princess Wencheng brought a 12-year-old statue of Sakyamuni in 64 1 year. Before that, it was called Xue Ji Wotang.

In the sixth year of Zhenguan (632), Songzan Gambo led his troops across the Yarlung Zangbo River and moved the capital from Zedang to Luodian (now Lhasa). In this way, not only can we get rid of the shackles and life threats of some hidden Tibetan aristocrats occupying the local area for generations; It is also possible to unify the political center and the military center to facilitate the command and control of the army, which is obviously of great significance for developing absolute monarchy and consolidating slavery. In addition, compared with the geographical location and natural conditions, Lhasa is also a good place to build a foundation and start a career. The climate here is pleasant, the scenery is beautiful and the products are rich. The center is flat and open, surrounded by mountains. The ravine in the distance is dangerous, and it can be attacked, retreated and defended. Later history proved that Lhasa was the right choice as the capital of the Tubo dynasty.