Silica dispersion was synthesized via acid-base two-step processing and sol-gel method. The prepared dispersion could build silica aerogel film on the surface of glass through the simple spin coating and atmospheric drying technology.Thus, the modification of low surface energy and construction of rough structure on the glass surface could realized through onestep method, then, the surface of glass was endowed with special properties such as water-proof, self-clean, etc. Different conditions of preparation such as whether aging affected the property of silica aerogel film were studied. The result shows that silica aerogel film on the surface of glass prepared from silica alcogel aged in 60 ℃ has excellent superhydrophobic effect: the water contact angle is 165 . 6 ^o , and the water roll-off angle is less than 1 ^o .