In the absence of solvent, a kind of carboxyl modified polyether organosilicon UV absorber(CPE-MUVS)was prepared. The chemical structure of CPE-MUVS was characterized by IR, 1H-NMR and Ultraviolet spectrum. Then,CPE-MUVS was emulsified to obtain the transparent emulsion. It was found that the average diameter and the Zeta potential of the emulsion were 33.08nm and -41.24mV, respectively by the Malvern nanometer particle-size and the Zeta potential analyzer. The application study of the compounded system ASO-1/CPE-MUVS was carried out with cotton fabric. The results indicated that ASO-1/CPE-MUVS could improve the UV-absorbing performance of the fabric. Meanwhile, CPE-MUVS could obviously decrease the bending stiffness, increase the water-absorbing of the fabric and had no influence on the whiteness of the fabric.