[Purpose]Effects of altered precipitation patterns on natural ecosystems with climate change has already become a hot topic of ecological study.Our purpose was to reveal the effects of altered precipitation patterns on the inorganic nitrogen (N) and net N mineralization.[Method]We conducted a greenhouse experiment with H.vulgaris across three drying-rewetting intensities and frequencies.We analyzed the content of nitrate and ammonium,net N mineralization and nitrification rate of the soils.[Result](1) Drying-rewetting intensity significantly affected soil inorganic N content of H.vulgaris.In the lowest drying-rewetting intensity,the ammonium content was the highest and nitrate content was the lowest than other two treatments.With drying-rewetting intensity increased,ammonium content decreased while nitrate content increased.(2) Drying-rewetting frequency significantly affected soil inorganic N content of H.vulgaris.With drying-rewetting frequency increased,ammonium content decreased while nitrate content increased.(3) There was a significant interactive effect between drying-rewetting intensity and frequency on soil inorganic N and net N mineralization.[Conclusion]Our results suggested that altered drying-rewetting intensity and frequency can affect N availability and N cycle in plant-soil system,which indirectly affect the soil inorganic N,net N mineralization and nitrification rate of H.vulgaris.