multi-source data mining system based on cloud computing service mode is designed in combination with three-layer and four-mode cloud computing service level system targeting such problems as underutilized multi-source distributed data and low data processing efficiency.Firstly, the technical flow of multi-source distributed data mining is elaborated; secondly, the cloud computing service level system is introduced to the system building and multi-source distributed data mining system frame in cloud computing environment is designed; finally, main features of this system are introduced in details, which lays foundation for further study on multi-source distributed data mining system.