People who often live in Dali, or those familiar with Xiaguan, know Longweiguan. From the Heilong Bridge on the Xiqiao River, continue north, and follow the slope to the top, it is Longweiguan. The Tianbao War, which was overturned by General Li Yan's 100,000-strong army, happened here. It became the most important pass in Dali, Nanxun. Together with the Longshou Pass, Shangguan protected the ancient city of Dali at the foot of Cangshan Mountain and the shore of Bohai Sea. Longweiguan became the most important part of Dali history. It has also become the source of the name of Xiaguan. Along the Heilong Bridge to the north, first is Longwei Street, pick up the steps, and on both sides are simple houses, although small, narrow and old, but clean, full of life; Cool chicken rice noodles, snacks, Li's roasted braised pork, barber shop, tailor shop, "Jisheng" clinic, seal bookstore, small department store...because the slope of the street is very large, the locals also call it "Shoukangpo". Three or three people, sitting on the stone steps on both sides of the street, there are chatting, there are tired and resting, for a moment, people seem to leave the hustle and bustle of Xiaguan City, into a quiet, we once had but have been far away from us in time and space. Longweiguan City Tower is more than 200 meters away from Heilong Bridge. The city building is the architectural style of the Ming and Qing Dynasties. The wide city wall sets off the small gate of the city gate, the arched city gate is about 5 meters high, and only 3 meters wide, reflecting the majesty of the one-man Guan Wanfu.