Addition of glycerin in zincate solution was first reported in consideration of its moisturizing function to improve the adhesive force of upper electroplating nickle layer. Method of observing liquid mark on pH test paper, time-potential curve measurement and thermal shock followed by cross cut test were utilized to study the retained liquid film distribution, the potential development of zincate film and adhesive force of electroplating nickle coating on aluminum substrate respectively after one time zincate immersion with different concentration of glycerin in zincate solution. It indicated that the retained liquid film became well-distributed when 20g/L glycerin was added and oxidation of the upperzincate layer caused by liquid film drying was conquered to guarantee the well-adhesion of successive electroplating coat.