Yunnan Province of China is located in the southwest border, bordering Myanmar in the West and Laos and Vietnam in the south. The whole southern part of Honghe Prefecture borders Vietnam, and Yunnan's three Sino-Vietnamese ports, two of which are in Honghe prefecture. So in Hekou, I plan to spend one day in Vietnam tomorrow, while in Hekou, many international travel agencies provide one-day trip to the Vietnamese border, which is a one-day trip to Sabah. So as soon as the bus arrived, I signed up for a station wagon across the road. The procedures for handling one-day passes at estuaries are quite stringent. In addition to filling in a full range of verifiable information and signing the names of three paper heads, two photographs are taken at travel agencies and public security bureaus, one for identification and one for certification. At 10 o'clock on time, the tour guide of the travel agency called me to go to the travel agency to prepare for departure. She took me across the border and then picked me up at the Vietnam Frontier Station by the tour guide there. Walking up to the Sino-Vietnamese border bridge on Nanxi River, I have no excitement about crossing the national gate at all. Instead, my domestic tour guide is very responsible for reminding me whether to take a picture in front of the national gate. He also told me that the right side of the bridge is the junction of Nanxi River and Honghe River, and the left side of the railway is the meter-gauge railway connecting China and Vietnam. Chinese tour guides sent me to Vietnam's frontier defense, where there have been several Vietnamese tour guides waiting there, are very beautiful girls, one mouth is fluent in Chinese. When I returned to the estuary from Sabah, it was sunset. When I crossed the Vietnamese border, I found that my entry stamp had not been struck on my border control certificate. So the tour guide immediately went to the entry window and struck an entry stamp. Then, when I left the country, I struck the exit stamp again. It shows that Vietnamese border control is not as strict as that in China.