Most researchers define semantic search to be search resources in the semantic web with basic inference function to find relevant resources needed by users. This definition satisfies user requests in most cases, but misses a class of actually existing search, which is called as "association search". Association search discovers and sorts complex relations between resouces in the semantic web, and object attributes are used to define associated relations between resources. Link path between resources may be more important than some certain resources, such as the links in national security may mean some potential security threats.