The Eclipse plug-in technology and data mining techniques were introduced. It was analyzed the mainstream of today’s open source data mining platforms, and it was compared, collated and summarized by means of experiments. Based on the experiments, the solution scheme was proposed. It was designed and implemented that an open source data mining platform based on Eclipse plug-in technology. The platform is modular, so it’s easy to maintain and extend. And there is no dependency between its processing unit and the data container, which makes it more suitable to a distributed environment and independent development.