Based on response surface methodology, roller speed of 394 mm.s-1, moisture content of 8-10 %, and feed rate of 45 kg.h-1 were the optimal values for efficient operation of the apricot nut cracker. The response parameters cracking efficiency, kernel damage, un-cracked nut and throughput capacity were obtained as75.99 %, 11.35 %, 3.75 % and 44.96 kg.h-1, respectively.