Leaf dark respiration plays an important role in plant carbon balance, but the characteristic ecological physiological effects of air temperature variations on leaf R in urban areas is not well known up to now. Leaf dark respiration during illumination varies between 16% and 77% of the respiratory activity in darkness, and the light inhibition of dark respiration seems to depend on the photosynthetic processes, and to lead to daytime carbon loss of plant leaves, which has important ecological effects on plant carbon balance. In this research, we used Li-6400(Li-Cor, USA) to make four different treatments of urban short-time air temperature raising (USATR) to examine its ecological physiological effects on leaf dark respiration(R) and typical photosynthetic characteristics in Beijing urban areas. We examined the ecological results of these four types of daytime USATR for affecting leaf dark respiration and photosynthetic characteristics of Rosa chinensis. The results show that: (1)Daytime USATR observably improved Transpiration rate (T_r), while it decreased intercellular concentration of CO₂. Stomatal conductance (Gs) in daytime USATR decreased in Summer, but in Autumn observably improved. (2) In daytime USATR of 5℃ in Summer for R_L was significantly higher than that in daytime USATR of 2℃ (P < 0.05), but daytime USATR of 2℃ had not obvious significances (P > 0.05); In daytime USATR in Autumn of 5℃ for R_L was also significantly higher than that in daytime USATR of 3℃ (P < 0.05), but daytime USATR of 3℃ had not obvious significances (P > 0.05). Four different types of daytime USATR in Summer and Autumn had obvious significances (P < 0.05) on daytime R measured by shading leaves (R_D). (3) Daytime USATR of 5℃ in Autumn had obvious significant effects (P < 0.05) on light-inhibited leaf R, but the other three types of daytime USATR were not significant (P > 0.05). (4) In Autumn, the sensitivity of R_L and R_D to temperature variations is higher during daytime USATR of 5℃ than that in daytime USATR of 3℃ (P < 0.05); In Summer, daytime USATR of 2℃ and 5℃ for R_L and R_D had not significantly differences (P > 0.05). The findings in our study are important for improving the estimation of urban leaf carbon loss under daytime USATR in urban areas, and are also beneficial to help build method to analyze plant carbon sinks for urban green spaces.