Abstarct: Presently in the South Pars gas field which is shared between Iran and Qatar, production is being done from two laxyers of four productive laxyers due to the special limitations and reservoir and geological characteristics. Considering to the reservoir and geological characteristics, and using multilateral and intelligent wells technology; laxyers that have limits on production can be exploited. Hence, it is important to study the reservoir properties like: permeability, porosity, formation type and etc., precisely; so that the best structure of multilateral well to be designed for maximum production and minimum cost. Optimization of design and well’s characteristics has a substantial impact on the production rate of hydrocarbon from the reservoir. According to the reservoir capabilities, well design is a very important point in achieving optimum production. The factors that can be used to optimization of design are well type, well geometry, tubing diameter, wellhead pressure and etc. In this study, for design; and evaluation of multilateral structures, the PROSPER software is being used. South Pars gas field reservoir model was constructed and the various multilateral wells have then been investigated. To evaluate the results of performed simulations, the rate of production wells have been compared with together. It was finally concluded that the use of dual opposed multilateral well with two slant branches for quick depletion of reservoir, is very appropriate. Then the optimization of effective components and well parameters was performed using nodal analysis. The obtained results indicate that gas production of the optimized dual opposed multilateral well is increased to 114 (MMscf/day) which is several times more than to the production rate of each normal existing wells.