Objective: The aim of this study is to investigate the development of auditory skills in Mandarin-speaking children with normal hearing using CAP-II, and to establish the baseline data for evaluating the auditory performance of children with hearing loss on which designs of appropriate hearing rehabilitation programs can be based. Materials and methods: A total of 223 children participated in this study of which 200 children aged from 1 to 60 months were finally included. Their normal hearing was confirmed by examination of hearing history and highrisk registers for hearing loss, as well as by hearing screening. All children were divided into 10 groups with 20 children in each group based on age. The CAP-II scale was administered to evaluate their development of auditory skills. Results: The categories of auditory performance scores of children with normal hearing improved with their age, the best-fit regression function for prediction of scores from age was Score = 0.94 & times; ln(age) + 0.08 & times; (age) + 1.16 and prediction of age from score was Age = 0.65 & times; (score)2-0.14 & times; (score)-0.23. The overall CAP-II scale exhibited good reliability and validity. Conclusions: and Significance: An improvement in auditory skill with age in children with normal hearing was observed. Ceiling performance in auditory skills was found at the age of 51 months for normal children. A conversion table between age and scores obtained from the data of this study can be used as a reference for the assessment of clinical hearing ability in children.