The main purpose of this study was to investigate the functions of the class blog, the approaches to practicing the digital museum in teaching, the process of applying both the class blog and the digital museum to teaching, and the effects of the class blog and the digital museum on the project-based learning. This action research lasted for 10 weeks and the subjects were 26 third-graders in the elementary school. It is hoped that this research would be great help to the elementary teachers in Taiwan to apply class blogs to teaching.