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The aim of the present study was to explore the effects of dicyandiamide（DCD）and surfactant on the form and content of nitro⁃ gen in digested slurry, using a laboratory simulation experiment with different combinations of application of the treatments. Six treatments were used：single application of digested slurry, digested slurry+8%DCD, digested slurry+16%DCD, digested slurry+surfactant, digested slurry+8%DCD+surfactant, and digested slurry+16%DCD+sufactant. The total nitrogen（TN）, total Kjeldahl nitrogen（TKN）, ammonium ni⁃ trogen（NH4+-N）, and nitrate nitrogen（NO3--N）content of digested slurry were measured at 10, 30 min, and 1, 3, 10, 24, 48 h. The results revealed that, in the digested slurry+8%DCD and digested slurry+16%DCD treatments, the concentrations of NH4+-N, TKN, and NO3--N in⁃ creased by 0.74%~8.96%, 24.67~59.70 mg·L-1, 13.42~145.88 times, respectively, and the concentrations of all three increased with the quantity of DCD. The addition of surfactant had little effect on the form and concentration of nitrogen in digested slurry. [ABSTRACT FROM AUTHOR]