By means of ¹⁵N tracer technigue, the nitrogen absorption of wheat in different ways of soil fertility improvement was studied in purple soils of the Sichuan Basin. The results indicated that the utilization rates of different treatments were in the order of ordinary cultivation with surface layer fertilization (the fertilization depth of 1-2cm) >cultivation by gathering soil with deep layer fertilization (45cm) >cultivation by gathering soil with subsurface layer fertilization (25cm) >cultivation by gathering soil with surface layer fertilization(1-2cm), in which the most high rate was up to 23.78%, and 38.7-44.1% of nitrogen during wheat growth came from nitrogen fertilizer. Before wheat jointing stage. NDFF values of wheat above ground in the treatment of surface layer fertilization were much higher than those in the treatments of subsurface and deep layer fertilization. Some improvement ways including ordinary cultivation with surface layer fertilization and cultivation by gathering soil with deep and subsurface layer fertilization could significantly increase the yield of wheat.