The research field of ebook has faced its first transforming period. While 2010 is recognized as the first year of the ebook era by publishers, vendors and stakeholders, it is believed that the general development of the ebook industry is getting steady and ready for the next burst of innovations. In this vein, the present study summarizes a quantitative synthesis of studies of ebook in the past 30 years, it examines the critical issues, trends and context of ebook research to form a theoretically solid basis that explains the ebookrelated practices. These results reflect the transformation of ebook studies from the initial stage to the stably growth, stakeholders including the libraries, publishers and information institutions are getting to actively take part in the ebook business. It is also forecasted that the future trend of ebook studies shall step forward to more application- and problem-oriented ways, practical issues that benefits the practice directly, such as the format, regulation and usage will get more and more attention.