In recent years, many knowledge-sharing forums were built up for learning on the Internet. For knowledge-sharing forum, how to enhance the virtual community members' learning effects is an important issue. This study implements an experiment with two experimental groups. One group tests with text only and another group tests with text and graphics. This study purpose tried to find out the different learning effects between two forms of knowledge-sharing. Result shows a significant difference between two experimental groups. People would have stronger learning memory and learning satisfaction when they were reading knowledge text with graphics. This result effectively contributes to the knowledge body of computer-mediated communication and knowledge-sharing. In addition, it could also help to improve the forum using and learning.