The importance and benefits of critical reading (CR) in the study of English as a Foreign
Language (EFL) are often emphasized by scholars, particularly in relation to extensive reading (ER).However, some related studies show that the Chinese ER textbooks do not pay much attention to CR, which indicates that students lack sufficient materials to foster their CR ability. Combining these aspects, this research aims to find the feasibility of using supplementary materials to foster CR ability in Chinese ER classes.