Abstract: This system reforms the older generational non-computerized grating spectrograph. By connected with a microcomputer, it realizes the computerization of spectra and spectral datum collecting and processing. This set of system includes more than ten functions; the collecting.display and storage of spectra and data, the selecting of absorption peaks, the processing (enlarging, comparing and arranging) of spectra, the shifting of coordinates and so on. The system adopts a structuralized editor program to merge spectra and datum processing into an organic whole, and uses complete Chinese prompting characters and the form of man machine conversation to operate. It is not only flexhle to he used by, but also simple to be operated with. Also, it has strong practicality and transplantahilily. and is easy to speread.