For sticky products, high molecular weight drying agents such as maltodextrin are used to achieve a successful drying. Thus, the effect of maltodextrin concentration is more prominent than that of feed flow rate [9]. Orange juice with three different concentration of maltodextrin (7%, 14% and 21%) was spray dried at 140°C inlet air temperature. The feed concentration will reduce when the maltodextrin concentration added was increased. The effect of maltodextrin concentration on the process outputs is presented in Table 3. Increment in the maltodextrin concentration led to lower outlet air temperature, higher outlet air humidity and relative humidity. Goula and Adamopoulos [1] reported that the addition of maltodextrin may lower the drying rate because the moisture is difficult to diffuse in larger maltodextrin molecules. Higher maltodextrin concentration also resulted in higher feed moisture content and consequently higher product moisture content. This is probably due to the reduction of total solid in the feed.