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The X-ray flares have usually been ascribed to long-lasting activities of thecentral engine of gamma-ray bursts (GRBs), e.g., fallback accretion. The GRBX-ray plateaus, however, favor a millisecond magnetar central engine. Thefallback accretion can be significantly suppressed due to the propeller effectof a magnetar. Therefore, if the propeller regime cannot resist the mass flowonto the surface of the magnetar efficiently, the X-ray flares raise upon themagnetar plateau would be hinted. In this work, such peculiar cases areconnected to the accretion process of a magnetar, and an implication formagnetar-disc structure is given. We investigate the repeating accretionprocess with multi-flare GRB 050730, and give a discussion for the accretinginduced variation of the magnetic field in GRB 111209A. Two or more flaresexhibit in the GRB 050730, GRB 060607A, and GRB 140304A; by adopting magnetarmass $M=1.4~ M_\odot$ and radius $R=12~\rm km$, the average mass flow rates ofthe corresponding surrounding disk are $3.53\times 10^{-4}~M_\odot~\rm s^{-1}$,$4.23\times 10^{-4}~M_\odot~\rm s^{-1}$, and $4.33\times 10^{-4}~M_\odot~\rms^{-1}$, and the corresponding average sizes of the magnetosphere are $5.01~\rm\times10^{6} cm$, $6.45~\rm \times10^{6} cm$, and $1.09~\rm \times10^{7} cm$,respectively. A statistic analysis that contains 8 GRBs within 12 flares showsthat the total mass loading in single flare is $\sim 2\times10^{-5}~M_{\odot}$. In the lost mass of a disk, there are about 0.1% used tofeed a collimated jet.

X-ray Flares Raising upon Magnetar Plateau as an Implication of a Surrounding Disk of Newborn Magnetized Neutron Star