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