The aim of the paper is to prepare time - tables for the bus networks under the special conditions of urban areas (El-Mansoura city as example). The time-table optimization presented herein is based on the minimization of bus units. The paper de scribes a computer program (in case of great bus networks, computer program using Turbo - Pascal can be used for saving time). The practical applications of this program lead s to good results. This program can also be applied for other public transport networks in urban areas.