The major purpose of this study was to compare the effectiveness between the Computer-Assisted Chinese Stem-Deriving Instruction (CACSDI) that was developed by the researchers and Teacher-Delivered Chinese Stem-Deriving Instruction (TCSDI). The CACSDI is expandable, reusable, and user-friendly. The subjects were two second-grade students and one third-grade student with word-recognition difficulties. An alternating treatments design of single subject research method was adopted. The major findings were as followed: 1. The learning outcomes of word recognition were significantly different between CACSDI and TCSDI for one poor reader but not significant for the other two readers. 2. Regarding to the learning attitude, all subjects tend to study word-recognition via computers and would like to recommend other students to use CACSDI.