Abstract: The application of modern testing technology in study of the inclusions in diamond can provide the important evidence about the origin of diamond and the evolution and the characteristics of the mantle lithosphere. LRM is applied in the study of the solid and fluid inclusions in diamond. The information about molecular oscillation and molecular ligand structure of the inclusions can be obtained by using the method. The chemical compositions of the inclusions in diamond can be analyzed and the formula of the inclusions can be obtained by using EPMA, and the name of the inclusion can be determined. The information about the major elements and trace elements of the inclusions can be gotten by using LA-ICPMS. It is the key to obtain successfully the important information about the inclusions in diamond that the testing methods are selected positively according to the types of the inclusions.