What is the best route and time to drive from Changsha to Tibet?

There are two ways to travel from Changsha to Tibet. One is via Wuhan, along the Yangtze River, to Chengdu, manager Tang, to Bangda, and take the southern line to Lhasa. The other is from Huaihua, Guiyang, Xingyi, Kunming, Lijiang, Dali, Deqin and Yanjing to Tibet. The two lines meet in Mangkang, Tibet. Choosing the season is very important. You should finish your trip before the rainy season every year, July or August, which is the rainy season in Tibet. When the rainy season comes, the potential danger of muddy roads, mudslides, landslides and landslides is great, and the journey is even more difficult. It is the best choice to complete the trip before the end of June. Because after a whole winter's cold, the road is hard and hard to walk. According to the above itinerary, you need at least two to three weeks to complete your journey. Because Lhasa is not a destination, you can also drive to Houzang and Shannan. I suggest that when you return, you can take the northern line of Sichuan-Tibet line, pass Naqu, Dingqing, Changdu and Queer Mountain, enter Sichuan, return to Chengdu and finally return to Changsha. In this way, you don't have to take the repeated route, and you can see more different scenery. This trip will take a total of three weeks. Don't worry.