Abstarct: Density current is a relative movement between the two laxyers of fluid that even little differences in density are created. From this perspective it can be said that density currents characteristics of the typical characteristics of open channel currents is very different. Distribution velocity and density horizontally in density currents in distribution sedimentation in current a major role and therefore affect many aspects of sedimentation. In this study the phenomenon of density current as sediment transport in reservoirs and canals was simulated by the Fluent numerical model. For calibration of model the experimental results of Haghiabi et al. (2009) were used. The purpose of this study was to find the most optimal dimensions of mesh and the best turbulence model in order to predict various characteristics of density. In this study, the average current velocity, distances of 1.6 m, 3.6 m and 5.6 m after 16, 34 and 54 seconds from the start of modeling was measured, respectively. In this study, the most optimal dimensions of mesh and the best of turbulence model was determined 300×240 k-epsilon of type RNG, respectively. Also prediction of the density was conducted in the slopes of 0, 1, 2 and 2/9 percent. the error of numerical model to predict density current velocity was 17, 10, 8 and 3 percent. Finally, density and average current velocity in the slope of 5 percent predicted. The results showed that whatever the bottom slope of flume is greater the error percentage of average current velocity is lower. While the increase in the slope of the flume increases the average current velocity and reduces the density of flow.