A Alginate impression material is a substance that is used to get the reverse shape or the negative shape of the tissues in the oral cavity. Then, this impression will be filled with gypsum product to get a model or a positive shape. Seldom, when the alginate impression is taken out from the oral cavity, it tears. Usually it is caused by the operator's fault during manipulation and taking it out from the mouth. Therefore, it is very important for a dentist to know haw to make the alginate not easily torn. Based on that fact, the author tried to make a research on "The Effect of Water Temperature Variations Towards The Tensile Strength of Alginate Impression Material". ln this study two kinds of alginate powder was mixed with water. The temperature of water was set at 5°C, 20°C, and 35°C. Seven samples were made for each material and temperature. It was showed that the tensile strength of alginate impression material was affected by the temperature of water. Then it can be concluded that the impression material which was mixed with cold water (5°C) and warm water (35°C) had lower tensile strength values than the one mixed with room temperature water (20°C). Consequently, it is better to use water with the right temperature as suggested by manufacturer to get the best result.