The invention provides a novel method for the finishing treatment of a fabric material with a silicone-containing fabric treatment agent, according to which the treated fabric material is imparted with a very pleasant touch with softness and hydrophilicity in contrast to the conventional methods of fabric treatment with silicones in which the treated fabric material is always imparted with water repellency. The inventive method is characteristic in the use of an organopolysiloxane having, in a molecule, at least one polyoxyalkylene pendant group bonded to the silicon atom and at least one amino-containing group such as --O--CH.sub.2 --CHOH--CH.sub.2 --NH.sub.2 bonded to the silicon atoms, as the effective ingredient of the silicone-based fabric treatment agent. Preparation of such organopolysiloxane compounds is disclosed.