From the spatial scale of township, the research on spatial interaction plays a key role in urban-rural integrated development and urban system planning. Spatial interaction models are techniques used by planners to understand and predict the location of activities and the movement of people, resources and information. The gravity model as classic and prevailing model one is based on Newton's gravity theory and utilizes the gravitational force concept as an analogy to explain the volume of trade, capital flows, and migration among the countries of the world. Given its parameter-free nature, the model requires as input only information on the population distribution when we analysis commuting and mobility fluxes. But the base of radiation model is ideal homo-geneous space ignoring that various flows between regions are not equally spread around places and this heterogeneity affects spatial configuration and interaction. Taking 16 towns in Daye county-level city as a case study, we obtain some important new findings as below:(1) we test the models against empirical data. (2) As for the direction of interaction, in each pair of towns, the influx intense to one region is difficult with its outflow in the radiation model while they are the same in the gravity model. (3) The spatial pattern of interaction reveals different characteristics from the result of these two methods.