<p>Gas hydrate extraction is inefficient and small in volume. Hydraulic fracturing is regarded as an effective means to increase the production of hydrate reservoirs by creating artificial complex fracture networks. However, due to the unique mechanical properties of hydrate reservoirs, the performance of hydraulic fracturing in actual operation is completely different from that of other reservoirs, and it is easy to cause reservoir destabilization or even engineering geologic disasters, so it is difficult for the traditional hydraulic fracturing theory system to be directly applied to hydrate reservoirs. However, there is still no systematic theory of hydrate reservoir fracturing, and the mechanism of fracture initiation and development has not been fully investigated. In this paper, the special geo-mechanical response of hydrate reservoirs is emphasized, and the indoor experimental study of hydraulic fracturing single cluster in hydrate reservoirs is carried out. The pattern of hydraulic fracture initiation and expansion in hydrate reservoirs with single cluster is explained. The results show that the hydrate saturation is in the range of 5.273% to 32.71%, and the higher the saturation, the better the fracture quality and stability. The presence of clay minerals weakens the integrity between sediment particles, and the fractures show complex and curved morphology, and the fracture performance is worse when the clay mineral content increases.</p>