The purpose of this study was to design a web-based instruction（WBI）with worksheet design, then to analyze the teaching effects on pupil's learning achievement, computer anxiety, and opinions concerning the teaching activities.
The action research of one group quasi-experimental design was adopted with 335 subjects of 3rd and 4th grades including 9 classes of Kangshan Elementary School in Kaohsing County. Two semester's WBI was divided into two phases and each phase had 18 weeks. The virtual CD-ROM learning design for basic Internet learning skills, which was developed by Golden-Soft Inc. was utilized in the first phase of teaching. The pupils could learn from shared CD-ROM system with different speeds depending on their performance. The second phase selected the theme "Ann-Ann's Kenting Trip" including 13 learning worksheets were designed by Author. Each pupil could explore the resources regarding assigned unit topics on the WWW and mailed their assignment to the teacher's E-mail address.
