In order to explore the N₂O emission amount and diurnal variation characteristic of sweet pepper  in the new cultivation mode, and  identify the optimal cultivation model for reducing N₂O emissions of vegetables, the static opaque chamber method was used to continuously determine the N₂O emission in embedded and whole ridge of three cultivation modes, including soil ridge, soil-ridged substrate-embedded cultivation (SSC) standard ridges, and SSC dwarf ridges. The results showed that during the measurement period, the N₂O emission flux at the seedling stage of sweet pepper presented two emission peaks. The N₂O fluxes manifested a high-emission during the day and low-emission at night. In the daytime (8:00—16:00), the N₂O flux of the SSC dwarf ridge was the largest, which was 0180 mg·m^-2·h^-1, while the N₂O emissions flux at the ridge of soil row was the smallest, 0.112 mg·m^-2·h^-1. At night (17:00—22:00),

the emissions flux of the N₂O of the SSC standard ridge was the largest, 0.113 mg·m^-2·h^-1, the emission flux of the ridge portion of the soil ridge was the smallest, which was 0.064 mg·m^-2·h^-1. There was no significant difference in the cumulative emission of  day and night among three cultivation modes. In addition, SSC dwarf ridge cultivation was more beneficial for sweet pepper growth than other cultivation modes. In conclusion, SSC dwarf ridge cultivation was beneficial for the vegetable growth in greenhouse. The present study could provide a reference for the technology research of reducing emissions and increasing efficiency of greenhouse vegetables.