TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: The dimethyl silane unit is of formula (1-3).R1-R6,R11=H, or 1-8C hydrocarbon;R13=1-8C aliphatic group, 6-8C aromatic group, hydroxyl or 1-22C fluorine-containing alkyl;L1-L3,L5=single bond or organic coupling group;a,m=0-2;b=0-500;x1,y1,x2,y2,z2=more than 0 to less than 100;x1+y1,x2+y2+z2=100;L4=multivalent organic coupling group comprising single bond, -CONH-, -NHCONH-, -OCONH-, -SO2NH- or -SO3-;Y1,Y2=-OH, -ORa, -CORa, -CO2Re, -CON(Ra)(Rb), -N(Ra)(Rb), -NHCORd, -NHCO2-Ra, -OCON(Ra)(Rb), -NHCON(Ra)(Rb), -SO3Re, -OSO3Re-SO2Rd, -NHSO2Rd, -SO2N(Ra)(Rb), N(Ra)(Rb)(Rc), -N(Ra)(Rb)(Rc)(Rg), -PO3(Re)(Rf), -OPO3(Re)(Rf) or -PO3(Rd)(Re);Ra-Rc=H or 1-8C linear, branched or cyclic alkyl;Rd=1-8C linear, branched or cyclic alkyl;Re,Rf=H, 1-8C linear, branched or cyclic alkyl, alkali metal, alkaline-earth metal or onium;andRg=1-8C linear, branched or cyclic alkyl, halogen, inorganic anion or organic anion.Preferred Component: The metal complex catalyst comprises metallic element, and oxo or hydroxy acid compound. The metallic element is chosen from elements of group 2A, 3B, 4A and 5A. The oxo or hydroxy acid compound is chosen from ( beta )-diketone, ketoester, hydroxycarboxylic acid or its ester, amino alcohol and enol-property active hydrogen compound. Preferred Composition: The composition further contains alkoxide compound and colloidal silica. The alkoxide compound contains silicon, aluminum, titanium, zirconium and/or its partial condensate. EXAMPLE - Tetramethoxy silane (in g) (8), hydrophilic polymer of formula (1-1) (4), ethyl alcohol (200), acetyl acetone (10), tetra-ethyl ortho-titanic acid (10) and purified water (100) were mixed and stirred at room temperature for 2 hours, to obtain sol-gel liquid. The obtained sol-gel liquid (500), aqueous solution of anionic surfactant (30), colloidal silica dispersoid aqueous solution (100) and purified water (450) were mixed, to obtain hydrophilic layer coating liquid. The hydrophilic-film forming composition had excellent durability, water resistance, stain resistance and self-cleaning property.