<p>Building urban green land and leveraging its multifunctional role—including ecological, recreational, aesthetic, and protective functions—is crucial for maintaining urban ecosystem balance and advancing sustainable urban development. Based on the multiple benefits of nature-based solutions (NbS), this paper evaluates the social and ecological benefits of urban green Spaces in the main urban area of Mianyang City by using various methods. On the basis of the identified deficiencies in accessibility and ecological networks, this study proposes layout optimization strategies aimed at enhancing multiple benefits such as social and ecological benefits was proposed. The results indicate that significant service blind areas exist in the main urban area of Mianyang city, where residents face challenges accessing green spaces within a 15-min walk. Ecological source areas within the green spaces are highly fragmented and unevenly distributed, with multiple ecological fault zones and ecological fault points, leading to low overall connectivity of the green space network. Establishing “stepping stone” green patches, restoring the fault zone, and addressing the fault point can effectively reduce the service blind area and enhance the overall connectivity of the ecological network. This research offers insights for cities seeking to optimize spatial layouts to maximize the multifunctional benefits of urban green spaces.</p>