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Liquid-liquid transition of water is an important concept in condensed-matter physics. Recently, it was claimed to have been confirmed in aqueous solutions based on annealing-induced upshift of glass-liquid transition temperature,. Here we report a universal water-content,, dependence offor aqueous solutions. Solutions withvitrify/devitrify at a constant temperature,, referring to freeze-concentrated phase withleft behind ice crystallization. Those solutions withtotally vitrify atunder conventional cooling/heating process though,of the samples annealed at temperatures  to effectively evoke ice recrystallization is stabilized at. Experiments on aqueous glycerol and 1,2,4-butanetriol solutions in literature were repeated, and the same samples subject to other annealing treatments equally reproduce the result. The upshift ofby annealing is attributable to freeze-concentrated phase of solutions instead of ‘liquid II phase of water’. Our work also provides a reliable method to determine hydration formula and to scrutinize solute-solvent interaction in solution.

Glass transition of aqueous solutions involving annealing-induced ice recrystallization resolves liquid-liquid transition puzzle of water