In order to achieve optimal use of water resources in agriculture and to increase water use efficiency, it is necessary to apply robust irrigation management particularly in surface methods. Deficit irrigation is an irrigation management method in which a technical - engineering method is used in order to supply the required water for irrigated plants so that the maximum use of water unit will be achieved. There are significant methods to apply deficit irrigation in surface irrigation and one method which has recently been used is alternate furrow irrigation. In this method in every round, the furrows are irrigated alternately;the water is collected in one side of planting rows and the wetting pattern will progress laterally as far as it can supply the required wet for unirrigated furrows. The more this progress, the more successful is irrigation. Therefore, this method is highly applicable in the soils with high degree of permeability and trivial slope because these characteristics would lead to increase in lateral progress. In this paper, effect of alternate furrow irrigation in a potato farm on water use efficiency was investigated through randomized complete block design (RCBD). The results showed that this method would significantly increase water use efficiency. Moreover, in this study the water use efficiency of potato in Charahmahal and Bakhtiari Province was compared with the values obtained from alternate furrow irrigation method. The results indicated that water use efficiency in fixed alternate furrow irrigation had significantly difference with other methods. And this efficiency was higher than the efficiencies in different parts of the province.