In order to deeply analyze the structural characteristics and collaborative mechanisms of the emergency response cooperation network for secondary and tertiary earthquakes，the "12·18" Jishishan earthquake in 2023 was taken as a typical case，and the social network method was used to analyze the emergency response collaboration network systematically based on the network structure，organizational relationships and organizational functions. The results show that the density of the Jishishan earthquake emergency cooperation network is low，and the cooperation between organizations is not close enough. There are 8 cohesive subgroups，the units of the same level are more inclined to cluster，and the units with similar functional attributes are more likely to form cohesive subgroups. The main body of the two or three level response is the provincial-level department，which is mainly the cohesion subgroup of the provincial command and coordination and emergency rescue functions. The cohesive subgroup formed by units at the national level mainly plays a coordinating and supporting role. Central enterprises and state-owned enterprises played an important role in this emergency response. However，it is necessary to break the administrative barriers and establish a cooperative emergency collaborative mechanism between the local government and the state-owned enterprises.