The ORHF and CAS CI calculations by MNDQ and PM3 parametrizations are carried out for poly-cation and -anion states of C60 in order to elucidate bond alternations and changes of ground spin multiplicities by doping of electrons or holes. The singlet state is calculated to be more stable than the triplet state for the dianion Of C60, in accordance with a recent experiment. A three-band model is constructed of the t1u orbitals of C60 in order to examine the itinerant ferro- and antiferro-magnetism. Implications of the calculated results are discussed in relation to the organic ferromagnetism observed in the C60. TDAE complex.