OSPF (Open Shortest Path First) is a typical link state routing protocol, and is widely used. Based on the intensive research of the packet type, packet header format and working principle of OSPF, an experimental network model including multi OSPF areas was designed. On the GNS3 platform, a simulation network environment was built, the routers and computers were configured, and the designed network model was successfully simulated. The simulation results verify the working process of OSPF, and provide a reference for the proper deployment of OSPF in the actual network.