Energy is an important factor which influences a traveler's travel satisfaction, and tour routes are the main carrier of tourists' expenditure of their energy in natural scenes. According to the characteristics of energy and its allocation rule, while designing tour lines of natural scenes, a limit should be put to the total length of the main tour route, enough resting facilities set up, and other elements like “bent”, “straight”, “dangerous”, or “flat” of the tour route reasonably used to conduct the tourists' energy allocation.