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Effect of the sodium adsorption ratio (SAR) and salt concentration of irrigated water on soil water infiltration and salt-water distribution in wetted soil volume under negative hydraulic head were analyzed by laboratory experiments. Results indicated that the relationships between each next parameter and time, maximal horizontal wetted distance (X), maximal vertical wetted distance (Z), and accumulated infiltration (I) were a power function. X, Z and I increased with the increasing of salt concentration and decreasing of SAR. The distribution of water content and electric conductivity in wetted soil volume could be described as a series of concentric ellipsoid, and had the linear relationship with the square of semi-axis of ellipse (A2). With the increasing of A，water content decreased and electric conductivity increased in wetted soil volume. With the increasing of SAR, average soil water content decreased and average electric conductivity increased under certain salt concentration. Salt concentration had no significant impact on average soil water content and average electric conductivity under certain SAR.