This paper describes the design idea and realization of a double-stage microcomputer spectral auto-measuring system. In this system

IBM PC microcompter is used as master system

a programable intelligent scan controller (MSC) is the sub-system

while all kinds of spectral instruments is the object to be controlled. IBM PC microcomputer manages and operates MSC by communicating. Adopted the management mode of grading control and parallel operation

this system truely realize the real-time control and data processing

so it has a better real-time feature.Even when executing a complicated processing and analysis

it also provides a higher measuring speed. With the help of specical software

this system can completes many

kinds of analysis automatically

such as colormetric analysis and computer aided chemistry analysis.