Abstract: A new interconnection network for multi-core processor,named the triplet-based hierarchical interconnection network(THIN),is presented.The topology of the network is very simple and it has obvious hierarchical,symmetric and scalable characteristics.The compare results show THIN is superior to 2-D mesh to construct interconnection network when there are not too many nodes.Results of simulation showed that THIN is a promising choice for multi-core processor with low network latency and high throughput.