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Drilling fluid (mud) is an important factor in drilling. Geothermal reservoirs are often found in local and regional faults which result in large permeability so that it often results in lost circulation during the drilling process. To prevent this, the hydrostatic pressure of the drilling fluid must be as small as possible compared to the formation pressure by adding additives. Addition of natural ingredients as additives has advantages compared to chemicals which are affordable, easily available and abundant and environmentally friendly. The research method uses laboratory studies with basic ingredients of water and bentonite and the addition of natural ingredients additives. The independent variable of banana midribs is 5 grams and 10 grams at temperatures of 80 0F, 150 0F and 300 0F. The dependent variables are density, viscosity, plastic viscosity, gel strength, yield point, mud cake and filtration loss. The results showed that the best natural additives to resolve lost circulation.