Abstract: C₆₀⁺radical has been optimized by using INDOmethod and the D_5d geometry for C₆₀⁺ was obtained.It is shown that the Jahn-Teller distortion took place in C₆₀⁺indeed,which led to the lengthening of the C₆₀sphere of original I_h symmetry along the C₅ axis.There are 7 kinds of bonds and 4 types of atoms in C₆₀⁺(D_5d),and the single bonds were shortened whereas the double bonds were lengthened,i.e.,the bond lengths tend to an average.Because the positive charge and unpaired electron are mainly distributed near the equator of C₆₀,the carbon atoms located close to the equator possess a higher reactivity.

Key words: C₆₀⁺radical, Jahn-Teller distortion, INDO