Switched mode power supplies (SMPS) is currently preferred due to safety and high efficiency. Flyback converter, which is one of topologies used by various switches, is capable of providing voltage isolation and multioutput. This article firstly attempts to investigate the topology of multioutput flyback converter, and then to model it in a computer based simulation utilizing from mathematical analysis. This simulation based modelling is designed to control the integrated circuit (IC) by getting ratio a voltage from unloaded feedback winding. Gate pulse providing from control circuit regulate output voltages by triggering MOSFET. The feedback signal is taken from one of the windings to perform good efficiency and best cost. Although the feedback winding is at desired voltage, other output is to change according to load conditions in outputs or to input voltages, because of mutual inductance and other condition. To represent the variables in the design of a flyback power supply with six isolated output, the model have been run properly on ORCAD 16.6 by showing the transient and steady state simulations of converter. Unlike other simulation programs, this model is fully designed for all nonlinear components without using blocks.