The effects of fertilization methods and forms of nitrogen fertilizers on nitrogen diffusion and migration were studied by filed micro-plot experiment. 4 fertilization methods (broadcast, mixed fertilization with 10 cm top soil, point fertili?zation at 10 cm depth, mixed fertilization with 3% soil at 10 cm depth) and 4 nitrogen fertilizers (urea, ammonium chloride, ammonium sulfate and ammonium phosphate) were investigated. The results showed that inorganic nitrogen concentration (INC) in 6 –16 cm soil of urea point fertilization treatment was higher than 200 mg/kg during 60 day incubation, higher than those of the other 3 fertilizer methods. The preservation capacity of the high INC in soil of the fertilization methods showed a sequence of point fertilization＞mixed fertilization with 3% soil＞mixed fertilization with 10 cm top soil＞broadcast. With the point fertilization method, the INC of urea treatment after 30 d and 60 d was higher than other three fertilization methods. The maximum INC was up to 544 mg/kg and 377 mg/kg for urea after incubated for 30 d and 60 d, respectively. While the similar values for ammonium chlorides were 324 mg/kg and 106 mg/kg, respectively. There was no significant difference between urea and ammonium phosphate treatments. The capacity of the 4 nitrogen fertilizers in maintaining the high INC in soil under point fertilization method followed the sequence of urea and ammonium phosphate>ammonium sulfate>ammonium chloride. The results demonstrated that the smaller the initial volume of the soil with which the nitrogen fertilizers mixed, the higher INC could achieved in soil and also the lower the inorganic nitrogen lost. Point fertilization of urea at 10 cm depth had obvious advantages in improving nitrogen use efficiency as compared with the conventional broadcast method.