Abstract: Based on the 4R marketing theory, this paper proposes that the relevancy between readers and subject librarians is the foundation of subject librarian service model. Then, the quick responses to the information and reader's demands have been discussed and proved to be the effective guarantee to realize the model. And the core idea and the most important part of the model is to set up and develop the long steady interactive relationship between the readers. Finally, it concludes that to meet and dig the reader's needs is an effective way to obtain the reader loyalty, improve the reader satisfaction, and ultimately win the subject librarian's self-realization.

Key words: 4R Marketing Theory