Node-cache-releasing delay tolerant network blockage avoiding method facing Epidemic route algorithm

The invention belongs to the delay tolerance network field, and particularly relates to a node-cache-releasing delay tolerant network blockage avoiding method facing an Epidemic route algorithm. The invention comprises steps of adopting a DTN node cache threshold setting method to perform storage threshold setting on the cache of the node in the network, adopting a DTM information threshold setting method to set an information forwarding hop threshold and an information forwarding copy number threshold on the information in the node cache, and determining whether any two nodes in the network are encountering. The invention achieves the threshold information through deleting information hops and information copies by performing information forwarding hop threshold setting and information forwarding copy number threshold setting when the node cache achieves the storage threshold so as to effectively control the information copies in the network and realizes the network blockage avoiding.