Abstract: By utilizing the complete information dynamic game analysis, this paper constructs the evolutionary game model of the digital resources sharing in university libraries, a solution is given to the perfect sub-game Nash equilib-rium so as to find the condition to realize the digital resources sharing. on this basis, it proposes three plots to benefit the union formation and stable operation of the digital resources sharing in library alliances, which is increasing the investment to improve cost, constructing the reasonable benefits distribution mechanism, and achieving the support of related sections.

Key words: library alliances; resource sharing; evolutionary game theory; Nash equilibrium