Since 2002, online databases began to be acquired into public libraries in Taiwan, at present; a lot of electronic resources are brought into collection and used heavily. As electronic resources collection of public libraries is diversified and various, but many librarians are incompetent for selecting, acquiring, and managing electronic resources. The article mainly discusses basic foundation and practices of electronic collection development and management in public libraries. First, it explores the missions and foundation of electronic resources collection;Second, it illuminates best practice of electronic collection development and management with three stages and eight functions, studies on how to propose electronic collection development polices how to select and acquire electronic resources and how to manage electronic resource collection with an electronic resources management system.