Two experiments were conducted to investigate the effects of dietary standardized ileal digestible (SID) valine (Val) level on growth performance, plasma amino acid and urea nitrogen contents of finishing pigs. Each experiment contained 360 barrows (Duroc×Landrace×Yorkshire) which were allotted to five treatments with six replicates per treatment and 12 pigs per replicate according to the similar body weight and genetic foundation. Average initial body weight of pigs in experiment 1 was (53.75±2.63) kg and in experiment 2 was (83.67±2.92) kg. In the same experiment, except dietary Val, the nutrient levels of experimental diets were referred to recommend the nutrient requirements of swine in NRC (2012). Dietary SID Val level was 0.50%, 0.55%, 0.60%, 0.65% and 0.70% in experiment 1, respectively, and the experiment lasted from 50 to 80 kg of body weight; dietary SID Val level was 0.43%, 0.48%, 0.53%, 0.58% and 0.63% in experiment 2, respectively, and the experiment lasted from 80 to 120 kg of body weight. The results showed as follows: in experiment 1, the average daily gain and feed/gain of treatments with the dietary SID Val level at 0.65% and 0.70% were not significantly different (P>0.05), but were significantly improved when compared with the treatment with the dietary SID Val level at 0.50% (P<0.05). In experiment 2, the average daily gain and feed/gain of treatments with the dietary SID Val level at 0.53%, 0.58% and 0.63% were not significantly different (P>0.05), but were significantly improved when compared with the treatment with the dietary SID Val level at 0.43% (P<0.05). With the dietary SID Val level increasing, the average daily gain and feed/gain had linear and quadratic trends in both experiments (P<0.01). In addition to plasma glutamate and proline contents of finishing pigs in experiment 2, plasma urea nitrogen, essential and non-essential amino acid contents of finishing pigs in both experiments were not significantly affected by dietary SID Val level (P>0.05). With broken-line model and quadratic regression model of the data from average daily gain and feed/gain, the dietary SID Val requirement is 0.61% to 0.66% when the dietary SID lysine level is 0.85% and the optimum SID Val level is 0.65% for 50 to 80 kg finishing pigs, and the dietary SID Val requirement is 0.52% to 0.56% when the dietary SID lysine level is 0.70% and the optimum SID Val level is 0.53% for 80 to 120 kg finishing pigs.