Waterfalls Rampah Menjangan, is one of the wetlands that are found in the Loksado. At this waterfall has a flow lowland river called Sungai Uyit, which serves as the water source for animals and plants that live nearby. This study aims to calculate the density and distribution patterns mouse deer (Tragulus javanicus) Regional Rampah Menjangan Loksado District. Most areas ii coastal lowland forest, which has a diversity of plants and animals are quite diverse, one of the fauna that mouse deer. The method used is, descriptive method, with the line transect technique, 5 pieces line with the distance between the 50 m line, and 2500 m wide roaming is used to determine the density while the distribution pattern by determining the point as much as 25 points on the transect line. Deer density value in the area of research, it was 0.192 ind./ha. The distribution pattern was 2,56 based on Morisita Index. It is stated that density and distribution pattern of the mouse deer in the Region Rampah Menjangan, Loksado is a group. Keywords: density, distribution pattern, mouse deer, Tragulus javanicus, waterfalls