Abstract: Under the omni media era,the diversification of propagation path of information will change the morphology of library service.Reference service of library will be faced on the new changes.This paper elaborates the connotation and characteristics of omnimedia,analyses the impact of omni media on university libray reference service,and discusses the reference service models of university library by using omni media in order to provide more specialized services for users.

Key words: omni media; university library; reference service; service model