Abstract: In order to provide theoretical basis for the harmonious development of urban-rural regional system in northern slope economic zone of Tian Mountain, the quantitative evaluation of urban-rural related development was conducted by the main elemental analysis in this article. The results indicated that urban-rural related degree is much closely related to the urbanization level and per capita GDP, which is present positive relevance, and significant grade and spatial discrepancies were found among the urban-rural related developmental levels in northern economic zone of Tian Mountain. Furthermore, the results obtained by main elemental analysis are basically consistent with the current urban-rural related developmental level in northern slope economic zone of Tian Mountain, which indicated that the quantitative evaluation of urban-rural related development by the main elemental analysis is feasible.