Abstract: Bioretention facility is one of the most widely used green stormwater infrastructures. Previous studies have mainly focused on the reduction of stormwater runoff volume and pollutants removal, while there is still a lack of systematic research on the emission characteristics of greenhouse gases (GHGs) such as CO₂, CH₄ and N₂O. In response to the above issues, this manuscript adopts a columnar simulation experiments in the laboratory to investigate the influence of the construction type of bioretention facilities on the greenhouse gases emission characteristics and carbon emssion reduction effects, using traditional green spaces as a reference. The results show that among the different types of bioretention facilities, the average emission fluxes of CO₂ and N₂O from the inverted bioretention facility are lower, which is 66.18 mg·m^-2·h^-1 and 2.98 μg·m^-2·h^-1, respectively; the inverted bioretention facility exhibits the lowest average total cumulative emission flux of GHGs, with a global warming potential of 226.69 kg·hm^-2; it can reduce CO₂ emissions by 0.551 kg per field. Therefore, the inverted bioretention facility can be preferentially selected for practical engineering applications to effectively reduce greenhouse gas emission fluxes. The above research provides support for the optimal design of bioretention facilities in the context of striving for the "dual-carbon" (carbon peaking and carbon neutrality).