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Structure evolution of an Al-Zn wrought alloy in remelting processing in the strain induced melt activated (SIMA)semi-solid procedure was observed, and effects of factors, the remelting temperature, the holding time, and the compression strain, on structures and grain sizes of the alloy were investigated. The results show that (1) the proper temperature of remelting is in the range of 610 to 615℃; (2) the grain size in specimen with greater compression strain is smaller than that with smaller compression strain in condition of the same remelting temperature and holding time, and the grain size in local area with great local equivalent strain is smaller than that with small one; (3) liquid occurs in form of cluster in matrix during remelting and its quantity increases with remelting time increasing; liquid in specimen with great compression strain occurs earlier than that with small one, and quantity of liquid in the center of specimen with greater local equivalent strain is greater than that in the two ends of it; (4) distortion energy after deforming in matrix of the alloy is the significant factor to activate melting of matrix at local area with great local equivalent strain.