Modern urban planning has gradually shifted from functional zoning to functional mixing, and functional mixing has become a consensus of urban planning. This study explores the mechanism of the influence of urban functional mixing degree on neighborhood and social inclusiveness, adopts the EBM-GML index to measure the total factor productivity of neighborhood and social inclusiveness, and constructs two-way fixed effects and panel threshold models to analyze the relationship between the two. Taking the panel data of City A from 2014 to 2024 as a sample, the study finds that the degree of urban functional mixing is significantly and positively correlated with neighborhood and social inclusiveness, and social inclusiveness grows by 0.099 percentage points for every 1 percentage point increase in the degree of urban functional mixing. The analysis of regional heterogeneity shows that the degree of urban functional mixing contributes most significantly to social inclusion in the western region, with a regression coefficient of 0.169. The dimensional analysis shows that land use is a key factor influencing social inclusion with a regression coefficient of 0.075. The analysis of the threshold effect shows that when the functional mix of the city exceeds the threshold of 221.6352, its facilitating effect is enhanced from 0.092 to 0.111 percentage points. The results of the study have important guiding significance for optimizing urban spatial layout and promoting harmonious urban development, and it is suggested that urban planning should pay attention to functional mixing, optimize the land use structure, and enhance the infrastructure interconnection between different regions, so as to enhance social inclusiveness.
