This experiment was conducted to investigate the effects of dietary energy level on energy utilization of Laoshan dairy goat at fattening period. Thirty female Laoshan dairy goats with an average weight of (18.43±0.76) kg were used in a single-factor randomized design and divided into 3 groups with 10 replicates in each group and 1 goat per replicate. Goats in three groups were fed diets with consistent crude protein, calcium and phosphorus levels, but with different digestive energy levels (10.40, 11.47 and 12.51 MJ/kg, respectively). The pretrial lasted for 10 d, and the trial lasted for 90 d. The results showed as follows: 1) with the increase of dietary energy level, gross energy increased, and gross energy digestibility, gross energy metabolic rate and digestive energy metabolic rate in 12.51 MJ/kg group were significantly higher than that in 10.40 MJ/kg group (P<0.05); there were significant differences among 3 groups in gross energy, fecal energy and urinary energy (P<0.05), and 10.40 MJ/kg group<11.47 MJ/kg group<12.51 MJ/kg group; methane energy in 10.40 MJ/kg group was significantly lower than that in 11.47 and 12.51 MJ/kg groups (P<0.05). 2) Final weight and average daily gain of goats in 10.40 MJ/kg group was significantly lower than those in 11.47 and 12.51 MJ/kg groups (P<0.05), and there were no significant differences between 11.47 MJ/kg group and 12.51MJ/kg group (P>0.05). 3) The regression formulas between digestible energy or metabolizable energy requirements and average daily gain of Laoshan dairy goats at fattening period were as follow: DE=0.675W^0.75+0.110ADG (P=0.006, R²=0.982); ME=0.526W^0.75+0.076ADG (P=0.027,R²=0.873) [DE was digestive energy (MJ/d), ME was metabolizable energy (MJ/d), W^0.75 was metabolic weight (kg), and ADG was average daily gain (g)]. In conclusion, the optimal dietary digestive energy level for female Laoshan dairy goats at fattening period is 11.47 to 12.51 MJ/kg (dry matter basis).