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Subsurface dam is a dam system that built in earth’s worb to reserve water and to increase levels of aquifer ground. Region with harsh climate conditions, low rainfall, land is uncultivated, low level of ground water then capacity to provide water is limited. Therefore, subsurface dam is a solution to help to improve the groundwater table, provide water during dry season. At coastal land, beside the advantage of reserve water, the subsurface dam also helps to present infiltration of salt water. This article discusses about subsurface dam, solutions to build the subsurface dam and its application scale, advantages and disadvantages of applying subsurface dams in Vietnam. Moreover, the author proposes solutions for water supply to areas which are shortage of water in Ninh Thuan province, Vietnam.