Which is the best route to drive from Beijing to Xishuangbanna?

From Beijing to Xishuangbanna, we will pass through many cities. When we walk on the road of the city, we will not be in any danger, but we only need to collect some tolls, but I think these fees are reasonable, so we should choose a legal way to go to road trip. After all, traveling is a happy thing. If something happens on the way, it will make our trip less pleasant, so choosing the safest route is a guarantee.