It is proved that 1) If 3 m n r,let s=16(n-m)2+(r-n)2+(r-m)2+12,if m+n+r>23s+3s2,graphs K(m,n,r)-A(|A|=2) are chromatically unique;

• 证明了1)当3mnr时,令s=16(n-m)2+(r-n)2+(r-m)2+12,若m+n+r>23s+3s2,则K(m,n,r)-A(A=2)是色唯一图;