Abstract: A two-factor experiment with randomized block design was conducted to evaluate the effects of irrigation and nitrogen management on root growth of tomato planting in the soil with high salt accumulating facilities (EC values was 1106 μS/cm). The results showed that compared to suitable irrigation (watering amount was 2.1 L/(plot·time)), water stress treatment (watering amount was 1.5 L/(plot·time)) decreased the root length, root surface area and root tip of tomato by 16.6%, 24.4% and 14.3%, respectively, and reduced the total uptake of nutrients by 21.7% on average; the tomato biomass in the sufficient irrigation treatment (watering amount was 2.7 L/(plot·time)) was higher by 35.5% than the suitable irrigation treatment, but N uptake in the sufficient irrigation treatment was lower than in the suitable irrigation treatment. Compared to traditional N management, reduced N management significantly increased the root length, root surface area, and root tip of the tomato by 2.9%-55.3%, 10.8%-55.5%, and 4.9%-62.7% respectively, plant height and total uptake of nutrients in the reduced N managements was higher by 12.7% and 38.5% than traditional N managements, in addition, the N recovery rate was 30.8% in the reduced N management, which was significantly higher than the N recovery rate 9.1% in the traditional N management. In general, reduce N management could promote the growth of crop roots and increase nitrogen use efficiency in the soil with high accumulation of salt under greenhouse conditions.