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Starting from the demand for electric power in Viet Nam in general and for the regional and remote ares, especially for coastal regions and Islands in particular, the research, design, fabrication, installation and operation of tidal power turbines with small and medium capacities for people's daily economic life in coastal regions and islands are indispensable and urgent. This paper presents design methods and calculation results of low head turbines applied in exploiting tidal power in Vietnam. In addition, simulation of the flow field in the diversion of the turbine is reported to evaluate the characteristic of the turbine work. The turbine model has the water column H = 1,2m, N = 1KW.