The researchers found that theory and practice were two separate topics in mathematics teachers’ education in the past. Therefore, I have set up the Knowledge Web of Mathematics Teachers (KWMT) on Internet as the learning sources of linking theory with practice. Then I investigate if the learning sources can be the bridge of theory with practice for mathematics teachers’ education. From the results of this action research, I find that the website has been able to be the bridge of theory and practice while student teachers are learning about mathematics teaching. I find that the student teachers can comment on the teaching cases from theories that they have learned at school. Also, student teachers’ knowledge/capability is growing.