Abstarct: According to the annual growth rate of world population that is more than 8.1 percent and limited resources to increase agricultural production, development of the optimization model for water and fertilizer use in agriculture is one the effective indexes to achieve strategic and sustainable use of water and soil resources. To do this important, knowledge of moisture distribution and plant nutrient in soil during crop growth period is necessary. Since doing the field experiment to determine the optimum amount of water and nutrient requirement is time-consuming, costly and low accuracy, so using computer models and numerical solution of current equations is more common and more accurate. But before using these models, the accuracy of results of such models should be evaluated in comparison with the results of field tests. HYDRUS-2D model used in this study is a comprehensive model to simulate the water movement, solute and heat transport in the soil. To do this study, a fertigation system along with transplanting of green pepper was implemented in year of 1389 in the field of faculty of agriculture, Shahrood University of Technology, located in Bastam city. The experimental field consists of two parts: Drip irrigation and surface irrigation. Water requirement of green pepper was estimated by pan evaporation data for 5 years, and it was provided to the plant. Also the amount of required fertilizer was identified baxsed on valid resources and was provided to the plant by fertigation system. The results showed the overall procedure of moisture distribution by the model is consistent with the rate of moisture changes gained in the field and the rate of nitrogen concentration changes estimated by the model is consistent with the value measured in the field. Other results showed that how the distribution of nitrogen implemented in the soil at various depths at different stages of plant growth is consistent with the rate of crop root development. Also other model simulations showed that drainage water below than crop root zone during the crop growing period was 0.01 % percent of distributed water and leaching of nitrogen was only 0.69% percent.