This document provides an overview of academic library consortia in China. It discusses the two major consortia, CALIS and CASHL. CALIS was established in 1998 and has over 1500 member libraries, while CASHL was established in 2003 and has over 800 member libraries. Both operate on a three-tier structure with national, regional, and local centers. They provide interlibrary loan and document delivery services to their members. The document also discusses quality control measures like service standards and assessments. Challenges facing the consortia include limited funding, uneven development between eastern and western libraries, and competition between the consortia.