To better explore the characteristics of nitrogen transportation in a small typical agricultural catchment,the water nitrogen form,concentration and loss fluxes were continuously monitored for one year. The results showed that: (1) During the observation period,the significant seasonal variations in water nitrogen concentrations were observed and the year-round average concentration of total nitrogen (TN),nitrate nitrogen (NO₃^-—N),ammonium nitrogen (NH₄⁺—N),and dissolved organic nitrogen (DON) are 2.14 mg/L,0.77 mg/L,0.25 mg/L,and 0.51 mg/L,respectively; the NO₃^-—N is the main form of transported N in the small catchment. (2) In the spring (March to May),the N transport fluxes contributed for 43.56% of the annual total nitrogen fluxes,while in autumn (September to November),the N transportation fluxes only accounted for 3.70% of annual total N transportation fluxes. (3) The run-off and human activity are the major drivers of the nitrogen transportation in the small agricultural watershed of hilly landscape.