Nitrogen nutrient efficiency has agreat significance to improve crop yield andquality，and the nutrient morphology regulation strategy of ammonium and nitrogen synergy is one of the means. In order to explore the effects of organic nitrogen and inorganic nitrogen source application and nitrification inhibitor onsoil ammonium nitrogendynamics，indoor soil culture experiments wereconducted，5 treatments with different proportions of ammonium thionitrate and oxamide weresetup，and the ratios of ammonium thionitrate and oxamide was100%∶0%，0%∶100%，25%∶75%，50%∶50%，75%∶25%. Inaddition，nitrification inhibitor DMPP treatment was added to each group to explore the effect of different nitrogen sources of inhibitor DMPP treatment on nitrogen conversion in fluvo-aquic soil(pH8.25)and paddy soil(pH5.48). The results showed that the combined application of slow-release nitrogen oxalamide and ammonium nitrate significantly affected the form and rate of soil ammonium thionitrate nutrient supply. Until the end of the 10thday ofincubation，the ammonium and nitrate nitrogen in the soil of slow-release nitrogen fertilizer oxalamide still showed a high level. The addition of DMPP increased the ammonium nitrogen contentof alltreatments，reduced the nitrate nitrogencontent，and improved the apparent nitrification rate and the ratio of ammonium to nitrate nitrogen of soil. Insummary，the different proportions of oxamide to ammonium thionitrate and the way of DMPP could realize the change of the ratio of ammonium tonitrate nitrogen insoil，and improve fertilizer utilization rate.