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By using the 3-point QCD sum rules, we calculate the transition form factorsof $D$ decays into the spin triplet axial vector mesons $a_1(1260)$, $f_1(1285)$, $f_1(1420)$. In the calculations, we consider the quark contents of eachmeson in detail. In view of the fact that the isospin of $a_1(1260)$ is one, wecalculate the $D^+ \rightarrow a_1^0 (1260)$ and $D^0 \rightarrow a_1^- (1260)$transition form factors separately. In the case of $ f_1(1285), f_1(1420)$, themixing between light flavor $SU(3)$ singlet and octet is taken into account.Based on the form factors obtained here, we give predictions for the branchingratios of relevant semileptonic decays, which can be tested in the futureexperiments.

$D \rightarrow a_1, f_1$ transition form factors and semileptonic decays via 3-point QCD sum rules