Technologies have promoted the development of global library document delivery alliance and resource sharing network on the basis of common platform, but it also brought out risks of demand fluctuation and cost increase, etc,. Digital sharing has also increased the infringement risk in this field. In global perspectives, improvements in effective user demands via reflection and innovation, enhancements of copyright management to reduce service risks, launches of user researches to improve service quality and professional improvements of librarians constitute the strategies for libraries to cope with the development dilemma in document delivery and resource sharing.