Saline water can be used to irrigate tomatoes in dry areas, but it can also harm the soil and affect crop quality. Scientists tested a new method called water-salt regulation (WSR) to see how it affects tomato quality and soil salinity. They found that using saline water with an electrical conductivity of 4.7 dS/m under the WSR method can improve tomato quality by increasing soluble solids and reducing sugar, organic acid, and vitamin C. The sugar-acid ratio was also in the right range. Although the yield decreased slightly with higher salinity levels, the soil salinity remained balanced. This means that in similar dry regions with limited freshwater, using saline water of 4.7 dS/m with the WSR method can help grow better tomatoes.