The invention discloses a spatial network enhanced OSPF routing method based on a determined link state. A routing protocol divides a spatial network state into determined link state change and undetermined link state change; the routing protocol produces a new link state notification when the determined link state change occurs, but the link state notification cannot be flooded to the network, and only a link state database and the current state of a neighbor state machine related to the link state change are updated; the original mechanism of the routing protocol is used for managing for theundetermined link state change. The spatial network enhanced OSPF routing method based on the determined link state disclosed by the invention is the low-overhead and high-performance routing protocol applied to the spatial network, the protocol overhead that the ground internet OSPF protocol is applied to the spatial network can be obviously reduced, and the routing convergence rate is accelerated.