The inadequacy in understanding human behavior spatial characteristics is a main obstacle for studying the theories and practice of relationship between man and land in geography. This paper regards human behavioral humanities in influencing culture, customs and policy. factors as to correspond to order, making use of the time-space section analysis method to study the basic mindset of the spatial behavior chosen by flowing people in the Qing Dynasty in southern Shaanxi.The result shows that the human space choice behavior follows the close by principle in customs, rather than superior principle in geographic environment. The general trend of flowing people's behavior chosen is to seek unit time result maximization. The human spatial behavioral choice enhanced the exterior connection of the human behavioral result in different districts and the nature difference in grade and level, and indicated the defect of simple "man-land" cause and effect relation seeking only from the interior of a district or a certain kind of human behavior in a traditional way. Investigating mutually affected relations of the human environmental behavior from the point of view of system or a drainage basin is an important way to uuderstand and grasp the essence and the mechanism of man-land relations.