This study designs and develops a representation and search method and a relevant system for dynamic linked data networks. The method can help users obtain the association around an entity when there are complicated entities and associations, and the network can be dynamically expanded through guided interaction. When users know multiple entities which are suspected to be associated, the minimum connected graph algorithm based on distributed computing is used to search out the association network. Application cases show that the proposed method and system can achieve good results and user experiences, and the system based on the method has been applied in many engineering projects such as Smart City, Safe City and Metropolitan IoT.