Digital environment at university libraries allows the application of information and communication technologies to automate and implement service activities, which support users in accessing information resources via digital tools such as Internet and social networks. The development of information services in digital environment is one of the important objectives of university libraries nowadays. This paper analyses impact of digital environment on library activities and information service implementation. It also discusses functions, characteristics and aspects that have impacts on the development of information services in the digital environment. Based on the analysis, the author suggests some criteria and quality assessment tools as well as trends in the development of information services in university libraries in the digital environment.