Abstract: Put a vessel containing a mixture of quantitative samples and Na₂O₂ into a oven， which was heated to 700 ℃ beforehand and keep 15 min, so that the samples could be decomposed. Take the vessel out and cool down, add hot water, keep it over night, so that the elements were measured deposit fully. Separate off large amount of solvent and solule irons by filter, then solve the deposit with HNO₃, control acidity at 2%. 28 metal elements including rare earth elements in rock and ore were measured by Y-type tube internal standard import to ICP-MS. CRM GBW07103 and GBW07105 were determined, the results fit the values of the standards. The typical rock characters in rare aerth picture of chondrite is identical with the result of rock identify.For the method using Na₂O₂ as solvent, so it is suitable for different type of geologic samples.