In study of daughter minerals in fluid inclusion the scanning electron microscope (SEM) has the advantages of high magnification, good image of the morphology, great depth of focus and ease of sample preparation. In addi- tion, it is equiped with XTray detector and photograph apparatus. In the first part of this paper the image-forming principle and the work way of SEM have been introduced in brief. In the second part the selection and preparation of samples and the experimental:procedures of the SEM study have been described in particular. In the third part application of SEM in the sthdy of daughter minerals in fluid inclusion has been introdu- ced. The authors have observed the daughter minerals in fluid inclusions from the Xihuas}aan tungsten deposit, South China and investigated sylvite, halite, wolframite, chlorite of them under SEM. Besides, the dautgher minerals of fluid inclusions were studied in SEM by Metzger and other authors from the Santa Rosa porphyry. copper (Peru)，the Zabargad gemstone deposit (Red Sea), the Jamestown fluorite deposit (Colorado)，the Witwatersrand Au depo- sit (Azania) and the Cu deposits (Namibia).The above-mentioned results indicate that the study of daughter minerals in fluid inclusions by use of SEM bas a bright prospect.