  In this work, we study the effect of $\mathcal{PT}$-symmetric complex
potentials on the transport properties of one non-Hermitian system, which is
formed by the coupling between a triple-quantum-dot molecule and two
semi-infinite leads. As a result, it is found that the $\mathcal{PT}$-symmetric
imaginary potentials take pronounced effects on transport properties of such a
system, including changes from antiresonance to resonance, shift of
antiresonance, and occurrence of new antiresonance, which are determined by the
interdot and dot-lead coupling manners. This study can be helpful in
understanding the quantum transport behaviors modified by the $\cal PT$
symmetry in non-Hermitian discrete systems.
