The residue classes of module 12 have 0, 1, 5 and 7 generators respectively, and these four generators can generate all the residue classes of module 12. Specifically, 0 is the unit element of the addition operation, 1 is the cyclic element of the addition operation of modulo 12, and 5 and 7 are also the cyclic elements of the addition operation of modulo 12, but they are not the minimum positive periods.