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ERD14 is an Arabidopsis dehydrin which belongs to group 2 of LEA proteins. The increase in ERD14 expression level during abiotic stresses has been indicated and in vitro experiment shows that ERD14 behaves like a chaperone. In this study, we observed that ERD14 was produced under none treated and abiotic stress treated Arabidopsis plants. The expression of ERD14 depended on plant developmental stages. Under normal condition and mannitol stress, ERD14 was phosphorylated in planta and phosphorylation might play a key role in the function of ERD14. Enhanced content of ERD14 could directly or indirectly rescue alcohol dehydrogenase from denaturation due to high temperature in planta while ERD14 knock-out mutants and wild type plants could not, implying that chaperone activity of ERD14 in vitro holds true under the physiological condition inside plant cells. Overexpressing ERD14 also conferred plants enhanced water deficit tolerance whereas knock-out of ERD14 led to severe drought sensitivity. ERD14 had an effect on seed germination which might be due to ERD14 role during dehydration period of seed development.