Abstract
In the study of geography, the intensity of interaction between two objects affected by distance is called spatial influence. The study of spatial influence is a concrete description and analysis of spatial interaction problems in the study of geography and regional economics, and it also summarizes analytical methods for spatial influence. According to the Tobler's First Law of Geography, the spatial interaction is affected by distance. Therefore, based on the Gravity Model, this paper discusses the distance decay function to analyze the situation and change of interaction strength between objects under the influence of distance. The field spread model is used to analyze the spatial attractiveness and radiation force of the city. The Breakpoint Theory reflects the specific strength of the intercity connections, especially the attraction of surrounding cities at the Breaking Point. These methods provide theoretical basis for urban regional planning, and have important practical significance for the sustainable development of cities in the future.
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