The embodiment of the invention discloses coding and routing method, system and nodes, relating to the technical field of network coding and improving the throughput capacity of a wireless mesh network. The coding and routing method comprises the following steps of: receiving a coding data packet; sending out an inter-stream codec packet to the next hop node when the coding data packet is the inter-stream codec packet; and carrying out the inter-stream coding and routing of an in-stream codec packet and broadcasting the inter-stream coding data packet after the inter-stream coding and routingto the next hop node when the coding data packet is the in-stream codec packet which is confirmed to carry out inter-stream coding. The embodiment of the invention is mainly applied to the wireless mesh network.