<p>Several single- and double-dihydroxyalkylamino groups were terminated on poly-siloxanes with different molecular weights through a four-step synthesis method using diethanolamine, allyl bromide, and hydrogen-containing silicone oil. The emulsified dihydroxyalkylamino modified poly-siloxane is coated onto the surface of fabric and used as a softener in fabric finishing. Compared to fabric treated with the commercial amino silicone oil softener, fabric treated with them can improve the hydrophilicity from hydrophobic to hydrophilic, and the tertiary amine structure can resist yellowing defects of the amino silicone oil, with the whiteness difference value in line with the normal yellowing value change range. It will not affect the color or brightness of the fabric. Fabric treated with such modified polydimethylsiloxane will increase the softness rating by more than 4.0. Meanwhile, its improved anti-static ability was indicated by fabric resistance lowered from 10¹³ to 10¹² Ω, and some tear strength values of modified poly-siloxane treated fabric are close to or better than that of the commercially available hydrophilic amino silicone.</p>