Abstract: Information Reference Service is not a simple technical labor process, but is a highly efficient mental labor process, which is also a process of knowledge analysis, organization, communication and transformation. The whole process involves the possession of the catalog indexer＇s knowledge depth and the degree of knowledge improvement. This article outlines six methods that help us to analyze, research and find the needed information.

Key words: Information Reference Service, Thinking of Catalog Indexing, Skills of Catalog Indexing