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In order to study the effects of humic acid on rice growth, soil respiration and inorganic nitrogen with different irrigation methods, three irrigation methods (control irrigation, flood irrigation and shallow wet irrigation) and five fertilization methods, including 100% inorganic nitrogen fertilizer (T1, 110kg/hm2), 30% humic acid fertilizer+70% inorganic nitrogen fertilizer (T2), 50% humic acid fertilizer +50% inorganic nitrogen fertilizer (T3), 70% humic acid fertilizer +30% inorganic nitrogen fertilizer (T4), 100% humic acid fertilizer (T5, 1500kg/hm2) were set up. The dry matter transport, carbon content of different organs, soil respiration and inorganic nitrogen were observed. The results showed that different irrigation and fertilizer treatments affected rice growth, soil respiration and nitrogen accumulation. Compared with other irrigation and fertilizer treatments, CT5, WT5 and FT5 treatments had significant advantages in dry matter transport of stems and leaves at the late heading stage, and the carbon content of each organ was relatively large at the mature stage;with the increase of humic acid content, soil respiration was increased under the three irrigation methods, the soil respiration rate under different fertilization rates with control irrigation was higher than that of flood irrigation and shallow wet irrigation, but there was no significant difference between flood irrigation and shallow wet irrigation, with the increase of humic acid, the contents of ammonium nitrogen and nitrate nitrogen was increased, and reached the maximum value under CT5 treatment. Therefore, under the control irrigation condition, application 1500kg/hm2 humic acid in the soil, the growth of rice and soil respiration and inorganic nitrogen content can be improved. After comprehensive consideration CT5 treatment can be the best treatment.