A data base management system for volcanic rocks based on dBASE Ш has been set up on microcomputer. The system for research of petrochemistry and geochemistry of volcanic rocks consists of six data bases: description of rock, analysis of oxide, REE, trace elements, isotope and minerals. More than two hundreds of information or data are stored in the six bases. The management system can be used to set up the structure of data bases, manage data, provide interfaces for application programs and exit system. The application programs contain those for the calculation of geochemistry and petrochemistry of volcanic rocks,mathematical statistics and for drawing various geochemistry diagrams. Data bases for volcanic rocks, its management system and application programs provide a convenient, practical and efficient tool for the research of geochemisty and petrochemistry of volcanic rocks.