The present paper describes a program fitting complex Mossbauer spectra of geological samples on the microcomputer system. It is written in FORTRAN一N and has several constrained conditions for choice. With the help of the CROM- EMCO system-1 microcomputer, the authors have used this program to deal with0the data of Mossbauer spectra of such common minerals 'as ilmenite, pyroxene, omphacite, hornblende, vivianite, staurolite, glauconite, biotite,hematite,magnetite and pyrrhotite, resulting in a "good fitting" for all the spectra.