Serving as a vital ecological space and public center for social activities, city play a key role in people’s urban life. Rational and efficient layout is essential to promote citizens’ participating level, which is the aim of building kinds of city parks. By investigating current situation of some typical city parks and inducing the data analysis method of GIS, POI and spatial autocorrection analysis, this research reveals the main feature of “high agglomeration and group” of city parks in major city centers in Mianyang and its positive effects. The research also shows that the number and spatial distribution density of city parks are strongly correlated with natural factors such as elevation, slope, and topography, as well as social factors including population, transportation, and economic growth, which causes an imbalanced layout geographically. Taking Mianyang as the research object, the aim of this paper is to visualize and quantitatively study the spatial distribution characteristics and its influencing factors, and provide basic analysis for the development of urban parks in Mianyang, and promote the implementation of Park City and Healthy City strategy in Mianyang.