Abstract: An evergreen broad-leaved forest (EBF), a bamboo forest (BF), a mixed forest (MF) and a coniferous forest (CF) on Jinyun Mountain, Chongqing, were selected to investigate the distribution characteristics of soil nitrogen affected by soil physical and chemical properties. The soil samples at 0-15, >15-30 and >30-60 cm depths were collected at the end of each month from April to October, 2012, and w(TN), w(NH₄⁺-N) and w(NO₃^--N) were subsequently measured. The results indicated that:1) w(TN), w(NH₄⁺-N) and w(NO₃^--N) showed decreasing trends in the vertical distribution with increasing depths for different forests, and w(NH₄⁺-N)>w(NO₃^--N). 2) The average nitrogen density at 0-60 cm depths for different forests was in the decreasing order:BF(1.037 kg/m²)>MF(0.783 kg/m²)≈EBF(0.778 kg/m²)>CF(0.747 kg/m²). 3) The seasonal variation of w(TN) was not regular, but seasonal variation regulations of w(NH₄⁺-N) and w(NO₃^--N) were spring⁺-N) and w(NO₃^--N) had positive relation to soil bulk density and w(SOC) (P<0.05), and there was certain correlation among other nutrients.