The experiment was conducted to investigate the effects of net energy (NE) levels and lysine (Lys) to NE ratio (Lys/NE) on the growth performance and carcass characteristics of the finishing swines fed low crude protein diet. Three hundred and sixty swines with average body weight of (60.58±2.50) kg were randomly allotted to 9 groups with 4 replicates per group and 10 swines per replicate. This experiment had 2 stages. The finishing swines were fed with 13.5% protein and amino acid supplemented diets in the first stage (60～80 kg), with 3 levels of NE (9.6, 10.0 and 10.3 MJ/kg) and 3 levels of Lys/NE (0.7, 0.8 and 0.9 g/MJ). The finishing swines were fed with 11.2% protein and amino acid supplemented diets in the second stage (80～100 kg), with 3 levels of NE (9.6, 10.0 and 10.3 MJ/kg) and 3 levels of Lys/NE (0.5, 0.6 and 0.7 g/MJ). The results showed as follows: in 60～80 kg stage, the different level of NE significantly increased the average daily gain (ADG), average daily feed intake (ADFI) and feed to gain ratio (F/G) (P<0.05 or P<0.01); in 80～100 kg stage, there were no significant differences on ADG, ADFI and F/G among different NE and Lys/NE groups (P>0.05); in the overall (60～100 kg) stage, the different level of NE and Lys/NE significantly increased the ADG (P<0.05), but there were no significant differences on carcass characteristics (P>0.05). There were no significant interaction effects of NE and Lys/NE on all indices (P>0.05). Comprehensive consideration of growth performance and carcass characteristics, the NE level of 10.3 MJ/kg and Lys/NE level of 0.9 (60～80 kg stage) and 0.6 g/MJ (80～100 kg stage) were suitable for finishing swines fed with low protein diet. ［Chinese Journal of Animal Nutrition, 2009，21(6）:822-828］