Study of Fractal Structure Characteristics of Urban System in Northern Shaanxi

Based on the fractal theory,a quantitative research of the hierarchical structure of urban system, spatial structure and spatial agglomeration characteristics in Northern Shaanxi was made. Working on a major database of Northern Shaanxi non-agricultural population over 2012,traffic map of Shaanxi Province. The results indicate that Yanan and Yulin urban system scale is more concentrated and distribution is more balanced. The Transport accessibility between towns is better. Towns can develop economic cooperation by using infrastructure. The spatial distribution features of urban system in two cities is relatively concentrated. Towns is mainly in the valley along the river which is the main development axes of the urban system. The spatial distribution of urban system in Northern Shaanxi is decreasing from the center to the periphery .The town system presents a cluster distribution.