This paper deals with review of exploration of resonance in symmetric top molecules in different vibrational excited states, v(t) = n ( n = 1, 2, 3, 4). Calculations for CF3CCH shows that resonance take place at k = x(ll) + (A - B) - 2A zeta/A zeta - (A - B) and k = x(ll) + (A - B) - 2A zeta/A zeta - (A - B) for v(10) = 2 and v(10) = 3 respectively. In order to account for splitting about 3 MHz for the - 2 series in v(10) = 4 is necessary to introduce the element [J, k, l vertical bar f(24)vertical bar J, k+2, l - 4] in fitting program.