Abstract：This paper has summarized the geological and geophysical characteristics of the Shuanghu-Gangmacuo-Longmucuo structural belt in Qiangtang. The blue schist, mélange, gravity anomaly，Pn wave anomaly and seismic tomography image show that the Shuanghu-Gangmacuo-Longmucuo structural belt may be a suture between Gondwana plate and Asia-India plate