Abstract: Seven certified reference materials of barite ores for chemical component analysis have been developed. GSO1 is ironbarite, GSO2 and GSO3 are fluorite barite, GSO4 and GSO5 are quartz barite, GSO6 is sulfidebarite and GSO7 is claybarite. Processed by ceramiclined ball mill, the sample size is -0.074 mm. The homogeneity test was performed by XRF analysis of Ba, Cu, Pb, Zn, Zr, Al, Si, Fe and Ca. The vibration test was also performed. 8 laboratories participated in the data certification and provided 7 standard values for BaSO4, BaO, SO3and Sr, 2 standard values for TFe2O3, 1 standard value for CaF2, as well as the standard or reference values for Cu, Pb, Zn and watersoluble salt. These seven standard reference barite ores were approved as the national primary reference materials (serial number is GBW 07811～GBW 07817) by General Administration of Quality Supervision, Inspection and Quarantine of China in April 2009.