A fermented milk product was developed based on simultaneous fermentation of reconstituted milk and black rice hydrolysate. The optimum saccharification conditions of black rice hydrolysate were found to be 60 ℃, 200 U/g and 7 h for temperature, enzyme loading and time, respectively. By using one-factor-at-a-time approach and orthogonal array design, the optimum fermentation conditions were determined as 5%, 20%, 3%, 40 ℃ and 4 h for sucrose concentration, black rice hydrolysate concentration, inoculum size, temperature and time, respectively. The resulting product had good quality and great potential for further development.