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Two plateaus and one following bump in the X-ray light curve of GRB 170714Ahave been detected by the \textit{Swift}/X-Ray Telescope, which could be verymeaningful for the central engine of gamma-ray bursts (GRBs), implying that theorigin of this burst might be different from that of other ultra-long GRBs. Wepropose that merging two neutron stars into a hyper-massive quark star (QS) andthen collapsing into a black hole (BH), with a delay time around $10^4$~s,could be responsible for those X-ray components. The hyper-massive QS isinitially in a fluid state, being turbulent and differentially rotating, butwould be solidified and release its latent heat injected into the GRB fireball(lasting about $10^3$~s during the liquid-solid phase transition). Magneticfield as high as $\sim 10^{15}$~G could be created by dynamo action of thenewborn liquid QS, and a magnetar-like central engine (after solidification)supplies significant energy for the second plateau. More energy could bereleased during a fall-back accretion after the post-merger QS collapses to aBH, and the X-ray bump forms. This post-merger QS model might be tested byfuture observations, with either advanced gravitational wave detectors (e.g.,advanced LIGO and VIRGO) or X-ray/optical telescopes.

X-ray light curve in GRB 170714A: evidence for quark star?