Abstract: Based on the network kernel density estimation algorithm and the characteristics of Zhengzhou city road network,the network kernel density estimation calculation model was designed based on network grid partitioning,which obtained the distribution results of kernel density of different types of POI networks in Zhengzhou City under the road network space.The three-dimensional visualization method was used to visually express the calculation results,revealing the inherent law of POI spatial distribution in Zhengzhou City.The results showed that:(1) the network grid segmentation kernel density estimation algorithm better reflected the distribution law of POI related to traffic by spatial density analysis of POI in road network space;(2) there were significant differences in the kernel density results of POI networks inside and outside the 3rd ring.The 3rd ring could be used as the boundary line of the current downtown area of Zhengzhou;(3) the distribution patterns and aggregation patterns of different types of POIs varied greatly,reflecting the huge differences between industries.