A two-phase flow model has been developed for analyzing and designing gas/condensate distribution pipeline network system. The model is developed based on looped-system approach with some modifications. In this model, a phase behavior model is implemented for predicting the fluid properties required for the governing equations for the network system. By utilizing the Linear Theory Method, the Beggs-Brill's two-phase flow model is implemented in this model to predict the hydrodynamic variables in each leg of the network using the iterative technique which is developed in this study. A generalization of the two-phase network model is provided thereby making it possible for the two-phase flow model used to be replaced with any other mat may be more applicable for the particular situation. Using the iterative procedure developed, pressure at all nodes, gas flow rate and liquid holdup at each leg can be predicted. The test results demonstrate that the model can serve as a predictive and design tool for solving a two-phase flow problem in a pipeline network.