Gated communities have become a common feature in recent decades and have been shown to lead to social inequality to the detriment of the poorest social classes. Because access to urban green space is crucial for both physical health and spiritual pleasure, it is often regarded as an indicator of social justice; however, there are many references to the current inequity in urban green space accessibility. Our study aimed first to measure the potential spatial accessibility of green space in the central urban area of Beijing; then to evaluate the socio-economic disparities in green space accessibility; and finally, to assess the effect of the policy of “opening up gated residential communities” on urban green space accessibility. We adopt the Gaussian-based two-step floating catchment to assess the spatial accessibility of green spaces in each residential zone in the central area of Beijing, and the ordinary least squares model was used to evaluate the inequity in accessibility caused by socio-economic disparities. The results reveal that lower income residential zones have remarkably lower access to green spaces. Next, by comparing the differences in accessibility equity between two comparable scenarios in which all communities have dismantled their fences, we unexpectedly find that the inequity of access to urban green space does not improve but becomes more pronounced. We attribute this result to socio-spatial polarization. Our findings can be used by urban planners to target current urban planning system reform and by policymakers to focus closely on the gradual spatial polarization between the rich and the poor.

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