Abstract: Based on the importance of unsafe construction behavior, the set of unsafe behavior was determined and a conceptual model was built for relationship among unsafe construction behavior through literature analysis and expert interview to enhance the management of construction safety. Based on14 pieces of investigation data, a network model of relationship among unsafe construction behavior was built by applying SNA and its structural feature, node attribute, influence and hierarchical clustering were investigated. The results show that key nodes of unsafe behavior can make up behavior reaction chains, and bridge nodes can be linked to form an unsafe behavior network which has a high risk, that the key kinds of key unsafe behavior are the irrational setup of work safety management institution and the improper design of safety inspection supervision system, that behavior reaction chains exist, including the irrational setup of production safety management institution led to errors in supervision and direction on condition, and that some kinds of behavior such as the irrational setup of production safety management institution can serve as a bridge node.

Key words: safety management, unsafe behavior, social network analysis(SNA), building operations, hierarchical clustering