Abstract: The present disclosure provides a satellite network deterministic route construction method, forwarding method, and system. The deterministic route construction method includes: according to service data and topology information of an entire satellite network, searching for a plurality of feasible paths from the source node to the destination node corresponding to the service data; according to transmission configuration information of the service data and the topology information of the entire satellite network, screening out, from the plurality of feasible paths, a feasible path satisfying a preset transmission demand as present target feasible path; and determining path overhead of each target feasible path, and selecting a feasible path with lowest path overhead as a deterministic forwarding path of the service data.