Contour ridging is a widely used soil conservation practice for slope farmland. Rainwater from side slopes ponding and deposition sediment in the furrow areas could induce the spatial distribution of soil nitrogen on slope within contour ridge system differ from that on traditional slope. Based on line sampling method，this study analyzed the contents of total nitrogen(TN)，NO^3--N and NH4+-N and their profiles distribution in ridges and furrows along with slope positions in order to determine the spatial distribution of soil nitrogen within contour ridge system in rocky mountainous areas of Northern China by the classical statistical and geostatistical methods. Results showed that soil nitrogen content in topsoil of rocky mountainous areas of Northern China was at the middle level. The variation coefficients of soil nitrogen ranged from 17.64% to 33.60%，and the variation in ridges was greater than that in furrows. The variation of TN content was the most significant with the change of slope positons，and was in order of downslope>toe slope>middle slope>upslope. However，the content of NO^3--N and NH4+-N in furrows at toe slope statistically increased by 66.30%～83.85% relative to other three slope positions，and no significant difference in ridges was observed among slope positions. In addition，the difference in soil nitrogen contents between ridges and furrows mainly reflected at upslope，down slope，and toe slope. Compared to furrows，TN content in ridges at upslope decreased by 21.34%，and NO^3--N and NH4+-N in ridges at toe slope decreased by 17.42%～37.47%，but soil nitrogen content in ridges at down slope increased by 21.56%～38.16%. Furthermore，the profile distribution of TN was related to slope position and feature point，but NO^3--N and NH4+-N profiles distribution were mainly controlled by feature points. Meanwhile，exponent function fitted the relationship between soil nitrogen content and soil depth. Thus，the pronounced heterogeneity existed for the spatial distribution of soil nitrogen within contour ridge system，which was determined by feature points and slope positions. These findings supply technological guidance for the improvement of nitrogen use efficiency within contour ridge system and the smooth promotion of precision agriculture.