This research was prepared in order to study the effect on the 66 kV power network in Lattakia province as a result of replace some of the traditional transmission lines in this network of the type Compact Lines , from only technically, any of the terms of the impact on the load flow in transmission lines, in a stable working system (natural), due to the impossibility of conducting this study on the ground a program was created allows the user to simulate various types of electrical networks radial and simple or complex loop , and the analysis of the technical performance of different cases of transmission lines (traditional and compact) and compare the results for both cases in normal working system.