The method is simple and convenient. First, 95% EtOH and 5% H2O are used to prepare an alcohol aqueous solution. AcOH is added to make the pH 4.5-5.5. Add silicon coupling agent under stirring to make the concentration reach 2%. After 5 minutes of hydrolysis, a hydrolyzate containing SiOH is formed. When using it to treat glass plates, it can be immersed for 1-2min with a little agitation, taken out and immersed in EtOH and rinsed twice. After drying, move to an 110 oven for 5-10min, or at room temperature and relative humidity 60% The product was obtained by drying under the conditions for 24 h. If an aminoalkylsilane coupling agent is used, it is not necessary to add HOAc. But the alcohol solution treatment method is not suitable for chlorosilane type coupling agent, which will polymerize in the alcohol solution. When using a trifunctional silane coupling agent solution at a concentration of 2%, a coating with a thickness of 3-8 molecules is obtained.