Abstract: Based on the panel data of 30 provinces （cities, autonomous regions） in China from 2005 to 2020, the entropy-weight TOPSIS model was used to calculate the common prosperity index and the new urbanization index, and the spatial Dubin model was used to reveal the spatial spillover effect of the new urbanization on common prosperity. The results showed that the common prosperity had obvious spatial aggregation characteristics; the improvement of the new urbanization level could not only promote the process of common prosperity in the region, but also have a positive spillover effect on the common prosperity of neighboring regions. In order to achieve the goal of common prosperity, it was necessary to further promote the high-quality development of new urbanization, improve the market transaction system, deepen regional cooperation, promote factor transfer, and strengthen the positive spatial spillover effect.

Key words: new urbanization, common prosperity, spatial spillover effect, spatial Dubin model