Abstarct: Agriculture in arid and semi-arid regions has many problems and soil hydrophobicity has become a serious problem in these areas in recent years. Hydrophobicity reduces the capacity of water infiltration into the soil, increases the surface runoff, reduces soil and water cohesion, and also reduces drenching ability. Remediation methods of soil hydrophobicity include the use of biochar, clay minerals, bioremediation and liming. In order to investigate the role of biochar in reducing the hydrophobicity, 10 level of sugarcane biochar (zero to 10%) in three soil water repellency (soil without hydrophobicity, soil with high and very severe hydrophobicity) were studied. In the first part of the research,water droplet penetration time andethanol droplet molarity were measuresd.Then the effect of biochar in the presence of saline water with different concentrations of sodium chloride and calcium chloride were investigated on these parameters. In the second part, the effect of biochar on some physical properties of hydrophobic soils, including soil pores, porosity and moisture feature curve were studied. The results of variance analysis showed that the amount and size of biochar effect and their interaction on droplet penetration time test and ethanol molarity test in studied soils were significant. In general, application of 1 to 3% of biochar in two levels of hydrophobic soil has changed the hydrophobicity class. The water penetration time at the high hydrophobicity level in both biochar sizes has changed to less than 60 seconds and the hydrophobicity class has changed to slightly hydrophobic, but at the very severe hydrophobic level, using finer biochar (<0.25 mm) had greater effect on reducing hydrophobicity and at the application of 2%, hydrophobicity class has changed from very severe to severe Also, the use of saline water in both hydrophobic soil levels increased soil hydrophobicity. The investigation of the soil moisture characteristic curve showed that increasing the biochar from zero to 5% in all levels of hydrophobicity increased water retention in the soil. An increase of biochar caused the increase of the volumetric moisture in all measuring points, especially in the initial suction of 0 to 100 cm, because the existence of large and medium pores are important in the water flow in the soil in this range of suction, and using biochar increases the large pores and as a result increases the retention of soil water in this suction. Also, adding biochar to the soil increased the moisture in the field capacity, permanent wilting point and soil plant available water. In addition, increasing soil hydrophobicity also reduces water retention in the soil and soil plant available water . This information can be used to manage the application of biochar in soil to reduce soil hydrophobicity.