A pot experiment was conducted, using winter wheat (Triticum aestivum L.cv Yangmai 6) growing in a clay loam and a clay, to investigate fate of fertilizer nitrogen (N) in soil N pools and plant parts after combined application of inorganic and organic fertilizers, i.e. ammonium sulphate and rabbit feces.The experiment was designed to have five treatments, namely Treatment IF (inorganic fertilizer N), Treatment OF (organic fertilizer N), Treatment IOF1 (combined application of inorganic fertilizer and organic N fertilizer labelled with ¹⁵N), Treatment IOF2 (combined application of organic fertilizer and inorganic N fertilizer labelled with ¹⁵N) and Treatment CK (no fertilizer N). Results show 1) the highest winter wheat grain yields were obtained in Treatments IF and IOF, and no significant difference was found between them both in clay loam and clay; 2) Treatment IOF increased plant uptake of organic-fertilizer-sourced ¹⁵N, by 57.1% and 133.3%, in grain and by 220% and 100% in whole plant in clay loam and clay, respectively, but decreased its uptake of inorganic-fertilizer-sourced ¹⁵N with them decreased by 31% and 17% in grain and by 27% and 15% in plant, in the two soils, respectively, suggesting that in Treatment IOF, inorganic fertilizer N increased the uptake of organic fertilizer ¹⁵N whereas organic N fertilizer decreased the uptake of inorganic fertilizer ¹⁵N; 3) compared with Treatment IF or OF, in clay loam Treatment IOF increased accumulation of inorganic and organic fertilizer ¹⁵N in vegetative organs of the plant growing, while in clay, it increased accumulation of inorganic fertilizer ¹⁵N in vegetative organs and organic fertilizer ¹⁵N in grains; and 4) compared with Treatment IF or OF, Treatment IOF at the maturity stage of wheat significantly increased fertilizer ¹⁵N recovery rate of the soil plant system and the two portions of fertilizers stimulated each other sequestration of ¹⁵N of the other in the soil microbial biomass N(MBN) pool, and correspondingly, N loss rate (NLR) of both organic and inorganic fertilizer ¹⁵N decreased significantly. It is quite obvious that compared with Treatment IF, the traditional fertilization method, Treatment IOF obtained similar grain yield, but increased fertilizer N recovery rate of the soil plant system.