A distributed hash table (DHT) intercommunication network system, an inter-domain node and an implementation method. The implementation method includes the following DHT query request processing flow: an inter-domain node receiving a DHT query request, which carries destination domain information and a resource identifier; the inter-domain node judging whether a current domain is a destination domain according to the destination domain information in the received DHT query request; the inter-domain node processing the DHT query request according to the judgment result, including: when the current domain is not the destination domain, querying inter-domain mapping information according to the destination domain information in the received DHT query request, and forwarding the inter-domain DHT query request and resource identifier to a next hop inter-domain node according to the query result of the inter-domain mapping information; and when the current domain is the destination domain, initiating an intra-domain query flow according to the received DHT query request. The above-mentioned system, node and method can solve the problem that it is difficult to realize the existing DHT overlapping network intercommunication scheme.
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