[Purpose/significance] In the general knowledge environment, the digital resources supporting the teaching and scientific research in colleges and universities are growing rapidly. In order to get rid of the dilemma of performance evaluation brought by massive digital resources, Electronical Resource System (ERS) emerged to explore the dynamic management and evaluation of digital resources. [Method/process] The library of UESTC introduced ERS, based on the built-in data of local server, configured basic data of collection, data of purchase funds, data of counter consumption, and referred to the calculation ideas and methods of the platform, designed resource evaluation indexes and built performance evaluation model of foreign electronic books from three dimensions of user demand, academic benefit and cost-benefit. [Result/conclusion] The performance evaluation model based on ERS will provide practical guidance for foreign book resources acquisition, improve the acquisition quality, improve the use efficiency, optimize the procurement budget and decision-making, and better realize the guarantee and promotion of literature resources for university teaching and research.