Asymmetric diurnal warming is one of the main features of global climate warming. Nighttime warming clearly impacts rice productions as well as methane (CH₄) and nitrous oxide (N₂O) emissions in paddy field. Silicon is beneficial element for crop growth. Silicate supply obviously increased yield, simultaneously decreased CH₄ emission in paddy field. Some reports have been available concerning nighttime warming or silicate supply effects on CH₄ and N₂O emissions in rice fields, but it is still unclear regarding the effects of both coupling on the emissions in paddy field. Field simulation experiment was conducted to investigate the effects of silicate supply on rice growth, yield and CH₄ and N₂O global warming potentials and emission intensity under nighttime warming. An aluminum foil reflective film was used to cover rice canopy at night (19:00-6:00) for nighttime warming excluding strong windy and rainy days under field conditions. The experiment was designed with two nighttime warming levels, i.e. nighttime warming (NW) and control (CK, ambient temperature), and two silicate supply levels, i.e. control (Si0) and Si1 (slag fertilizer, 200 kgSiO₂/hm²). The results showed that silicate application could alleviate the inhibitory effect of nighttime warming on root activity, the dry weight of aboveground and belowground as well as yield in rice. Nighttime warming significantly increased CH₄ cumulative emission, in contrast, silicate application significantly reduced CH₄ cumulative emission. The CH₄ cumulative emission in the treatment with silicate application under nighttime warming was 48.12%, 49.16%, 61.59% and 39.13% lower than that without silicate application at tillering stage, jointing stage, heading-flowering stage, and filling stage. Night warming or silicate application could promote N₂O emission in the field. Under nighttime warming, N₂O cumulative emission in the treatment with silicate application at the above-mentioned growth stages and the whole growth period was 78.17%, 51.45%, 52.01%, 26.14%, and 40.70% higher than that in the control (without silicate application). This findings suggest that silicate application was helpful in alleviating the stimulative effects of nighttime warming on the warming potential and emission intensity in the paddy field.