In Taiwan, primary mathematical education currently adopts teacher-centered learning. Teachers are the main source of course and students must to be engaged in the same activity in the same place at the same time. In this study, we designed a digital game-based learning system which called "Math Island" to help students' mathematics learning by themselves. In the system, we produced 488 mathematics interactive materials, videos and games into a management game and combing "knowledge map" help students to understand the relationships of mathematic concepts. In the system, students can learn mathematics by their own pace by a variety kinds of learning tasks to learn different types of mathematical materials. Moreover, we also collection all user data toward the system and examine how the Math Island system influences on students learning performance and progress. The preliminary results showed that the Math Island may help students make a good progress. In the future, we will In-depth analysis in the further research and implement a diagnosed mechanism to help students learning.