The first results relating to heterogeneous vibrational relaxation of carbon monoxide in an Al2O3 ceramics tube are reported, together with an estimation of its probability. It was found that the probability of heterogeneous relaxation εv of the first-excited state of CO on the Al2O3 surface lies in the range (5 to 7) × 10(-2). The measurements show that the probabilities of heterogeneous relaxation of CO(X(1)Σ, v) do not depend on the value of v, at least for v = 1, 2 and 3.