Fuente: WIPO "dairy products" The invention discloses a preparation process of a Kefir fermented dairy product. The preparation process comprises the following steps of: 1, homogenizing the mixed liquid of raw material milk with the protein content of 2.5-3.5% and white granulated sugar and sterilizing; 2, cooling and inoculating Kefir base leaven KM-01 and yeast grains into the mixed liquid and fermenting at 25-35 DEG C to obtain fermented milk at the end of the fermentation, wherein 0.02-0.1g of Kefir base leaven KM-01 and 0-0.1g of yeast grains are used relative to every one kilogram of the total raw material; and 3, turning over raw materials in a jar, cooling, filling and sealing and after-ripening. The invention also discloses a Kefir fermented dairy product prepared by the preparation process. Through adoption the preparation process disclosed by the invention, the traditional preparation process is greatly simplified and the controllability of the preparation process is improved remarkably. The Kefir fermented dairy product has good taste and meets the taste requirement of Chinese people; the taste of the fermented dairy product can be changed through controlling the parameters of the preparation process and different consumption demands of consumers on the fermented dairy product can be met.