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The soil salinity is one of the most important and most dangerous problems in the world, and it’s meant by the accumulation of dissolved salts in the area of root spread, to the extent that impedes the ideal growth of the plant, and the process of salt accumulation on the ground is affected by the water balance, as this water balance is affected by climatic conditions and human activity. From here originated the problem of this research to know the effect of soil salinity on the growth of tomato seeds, where tomato seeds were used for their rapid growth and because of the importance of tomatoes for the society’s food, the independent variable of the experiment was the type of water (fresh water and salt water in different concentrations), and the dependent variable ( Tomato seeds) in soil suitable for cultivation, the soil was placed in two different bowls due to the different type of water used, then tomato seeds were placed in the two bowls in equal quantities and under the same conditions in terms of exposure to sunlight and for ventilation, and they were watered with fresh water and salt water in different concentrations daily, and monitor the growth of tomato seeds In the two bowls. After nine days, the growth of tomato seeds that were watered with fresh water was clearly observed. As for the tomato seeds that were watered with salt water in different concentrations did not grow, it was concluded that fresh water is effective in the growth of tomato seeds and thus all types of plants, while salt water did not help the growth of tomato seeds, and therefore have negative effects on the soil and the plant. From practical experience, the researchers recommend measuring the salinity of the water before watering the plants and educating the farmers about watering the agricultural crops with fresh water that helps their growth in a greater and better way and thus increases the quality of agricultural production.