Abstract: Using data mining technology to find hidden information in the marine exploration data is important for increasing the marine data using efficiently. The core functions of marine geological data mining system (MGDMS) was developed in the Python, the graphical user interface (GUI) was designed in the WinForm, and finally the interaction between GUI and the core functions was realized via parameter transformation and transference. Based on the geological and geophysical data, the ages of seamount in the Pacific are predicted using the MGDMS, and the predicted ages are more precise than those of conventional Kriging method. Our case study result indicates that the functions of data preprocessing, index analysis, and overall evaluation with the MGDMS are suitable for marine geophysical data mining.