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In this work, the annihilation process of subgrain boundary (SGB) and splitting of low-angle symmetric till grain boundaries(GBs) during plastic deformation in the representatively system of these materials near but below the melting point and the temperature far from liquid-solid coexistence line were simulated using the phase filed crystals(PFC) model, respectively.The results show that premelting GBs at the temperature far from liquid-solid coexistence line will split into two SGBs and glide under strain.