  In this paper, we investigate the effective potential and echoes from the
dyonic black hole with quintessence. For a dyonic black hole, the
quasi-topological electromagnetism provides proper matter energy-momentum
tensor to curve the spacetime, and quintessence strengthens this force. We find
that when the effect of quintessence becomes stronger, the black hole potential
transforms between single-peak and double-peak, which will influence the
existence of black hole echoes. In particular, we find that observer will
receive a sudden vanishment of high-frequency echoes when quintessence remains
a relatively strong effect.
