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We observe the influence of Al occupancies in Li sites on the formation process of the garnet solid electrolyte of Li7La3Zr2O12 (LLZO).A direct incorporation of Al is first promoted in a Li-insufficient garnet solid electrolyte during the calcination process of 850 ℃ and then the cubic phase of LLZO is obtained after successive annealing step of 1000 ℃.Comparing to pristine LLZO,Al incorporated LLZO shows less formation of Li2CO3,keeping crystallographic and physicochemical properties.This Al incorporation improves both the ionic conductivity and interracial resistance to poisoning procedure.