The catalyst of the present invention contains no Cr and other harmful matters, may be prepared through common industrial soaking process or co-precipitation process, and has excellent catalytic activity, selectivity and stability. Using the said catalyst and liquid phase hydrogenating process in fixed bed with reaction pressure of 1-4 MPa, reaction temperature of 100-250 deg.c, liquid phase space velocity of 0.1-1/Hr and H2-to-oil ratio of 500-2000, can be obtained the sec-octanone converting rate up to 99.0 % and sec-octanol selectivity of 98.0%.