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The applied magnetic field can result in evident changes on the charge-ordering transitions in both Cu-based high Tc superconductors and Mn-based colossal magnetioresistance materials. Alteations of charge modulation and melting of well-defined charge stripes can be commonly observed when the magnetic field is over 2 T. We herein present the experimental data obtained in LaCuO4.08 and Pr0.5Sr0.5MnO3 materials, illustrating this kind of interesting phenomena at low temperatures. In particular, some essential structural features alteating along with charge-ordering transition have been discussed.