The nitrate nitroge horizontal transport of mainly paddy soil(Wushan soil) in Tai Lake area was studied. The results were as follows: The concentration of nitrate nitroge in horizontal transport decreased with the increasing distance of the tracer source and changed with logarithm function. The transport concentration of the nitrate nitroge was in a sharp positive relation with the soil moisture content and changed with exponential function. The horizontal transport velocity of nitrate nitroge was significant relation with the distance of the tracer source in power function. Therefore, the velocity of nitrate nitroge horizontal transport was controlled both by the concentration gradient and soil water potential gradient from begin to 20 cm in horizontal soil column. It was stable after 20 cm, which was controlled by soil matric potential.