To explore the optimization strategy of the spatial structure of urban parks, this study took Hangzhou Chengbei Sports Park as an example. It used the spatial sentence method, behavior notation method, and nuclear density estimation method to analyze the spatial clustering characteristics of visitors with different attributes in the park, proposed corresponding spatial optimization strategies to improve the park landscape quality and node utilization rate and provide theoretical reference for activating park vitality. The results showed that: the spatial distribution of youth and infants and children was consistent and differed significantly from the spatial clustering characteristics of the other two groups; the spatial distribution of different activity types was affected by the natural environment, service facilities, spatial accessibility, and spatial enclosure; the spatial agglomeration characteristics of varying gender groups showed differences. It is recommended to strengthen the overall spatial connection of the park and guide visitors to visit the park by beautifying the landscape along the park road; to increase resting nodes or different types of service facilities to create staying spaces for different kinds of users’ needs, but avoid forming overly enclosed spaces, and at the same time strengthen the traffic diversion of nodes.