A gel polish composition forming a nail gel film on a keratinous material of mammals comprises a film-forming polymer selected from the group consisting of polyurethane resin, acrylic resin, and mixtures thereof and a method of forming a nail gel film on a keratinous material of mammals comprises: (i) cleansing the keratinous material； (ii) painting a gel polish composition on the keratinous material to form a first layer, wherein the gel polish composition comprises an film-forming polymer, a hydrophilic solvent, a thickening agent, water, and an optional care ingredient；(iii) drying the gel polish composition in air for about 1 minute； (iv) applying a second layer of the gel polish composition； (v) drying the gel polish composition in air for about 1 minute； (vi) optionally applying a third layer； and (vii) peeling off the nail gel film formed on the keratinous material of mammals without using a polish remover.
