A method and apparatus for ensuring a deterministic latency of a network slice, a storage medium, and a product, and belongs to the field of communication technologies. In this solution, topology information of different network slices can be associated with different gate scheduling periods, and the first device can determine a forwarding path of a service flow based on an SLA requirement and an association relationship between topology information and a gate scheduling period, so as to ensure a deterministic latency of the network slice. In addition, because different network slices can be associated with different gate scheduling periods, when the network slices are used to carry various service flows, different service flows may be scheduled and forwarded based on different gate scheduling periods, to meet latency jitter requirements of different services, and ensure deterministic latencies of various services.