The method used in this study is to simulate slopes that occur crack and get the influence of water saturation. The simulation is made with a computer application program, which is a program for calculating slope stability. The results of the analysis in this study found that the occurrence of cracks on the slope surface, the slope safety number will decrease when the crack is entered by water. Water entering the soil crack will cause pore water pressure which will then provide additional impetus to the slope landslide field. The greater the pore water pressure, the greater the decrease in security numbers. Besides that, the crack position from the edge of the slope has an effect on decreasing slope safety factor. A far the position of the crack from the edge of the slope increases the safety factor. The biggest decrease occurred in the position of 3 m crack from the edge of the slope. Crack positions greater than 3 m are the same. This happens because the slope failure field occurs at about 3 m from the edge of the slope.