Currently, drip-tape irrigation systems are used common for row crops due to water scarcity in the Iran. The progress of root development system depends on soil moisture and nitrate is affected by moisture front, it is necessary to study the pattern of nitrogen nitrate in soil to increase water and nitrogen utilization efficiency. The goals of this study were investigating the distribution of nitrogen nitrate in soil under drip-tape irrigation of maize and simulation of nitrate distribution pattern, using HYDRUS-2D software. The experimental treatments were two nitrogen levels, contain 50 kg N ha -1 (N50) and 100 kg N ha -1 (N100). Soil samples were taken from 0, 10, 20, and 30 cm from drip-tape in depth of 0-5, 10-15, 20-25, 30-35, 40-45, and 55-60 cm from soil surface with three replicates. The soil samples were taken one day before fertigation (1DBF) and one day after fertigation (1DAF) for two nitrogen levels, and also one day after the first irrigation (1DA1I), and three days after the fourth irrigation (3DA4I) at N100 fertilizer level. The results showed that the coefficient of variation of nitrate was high at a distance of zero from the tape line and a depth of 0 to 30 cm of soil. For N100, the coefficient of variation of transitions of nitrate was high in the first four layers of soil, while at fertilization level of N50 is only high in the first two layers of soil. More fertilizer split caused increasing fertilizer distribution uniformity in soil profile. For fertigation management, nitrate distribution trend follows the wetting front in the soil and the nitrate goes further in the horizontal direction. However, in cases of irrigation without fertilizer, with moving the water in the soil, the nitrate moves more in the vertical direction. The suitable place for measuring NO 3 -N ( ) was obtained at a depth of 25 to 35 cm and at a distance of 10 to 20 cm from the drip-tape. An appropriate location for measuring soil moisture ( was obtained at a depth of 25 to 30 cm and at a distance of 5 to 10 cm from the drip-tape. The common area between these two parameters, which indicates the proper location of the measurements and , is at a depth of 25 to 30 cm and a distance of 10 to 15 cm from the drip-tape. The results of the simulation of nitrate distribution in soil with HYDRUS-2D model showed that, the model's ability to simulate the distribution of nitrate in the soil decreased, with increase of depth from soil surface and distance from drip-tape. As well as the standard deviation of simulated data along in the longitudinal direction of the soil, it was more than the transverse direction of the soil and at the cross-section of the soil, the standard deviation of simulated data at depths of 30 to 35 cm was more than the rest of the layers. Key Words :Nitrate, Fertigation, Drip-Tape Irrigation, Maize, HYDRUS-2D