This study on LuongPhuong broiler with three groups were fed 3 different diets. The control diet (CD) did'nt have Leucaena leaf meal and stylo grass meal, but the experiment group 1 (EG 1) have 2 percent Leucaena leaf meal in the period 15- 42 days old and 4 percent Leucaena leaf meal in the period 43- 70 days old, the experiment group 2 (EG 2) have 2 percent and 4 percent stylo grass meal corresponding to two period mentioned above. These diets are adjusted to have the same level of metabolic ennergy and protein (3,000 kcal/kg and 20 percent protein in the period 15- 42 days old, 3,000 kcal/kg and 18 percent protein in the period 43-70 days old). The results show that: Leucaena leaf meal and Stylo grass meal have a significant effect to body weight gain, feed consumption, feed converion and feed cost for 1 kg body weight gain of broiler. These indicators of EG 1 and EG 2 are significant diferenses compared with the control group (P 0.05). EG I have weight, body weight gain higher than EG 2 and FCR/1 kg body weight gain lower than EG 2 with no significant difference (p 0.05), feed cost/kg body weight gain of EG 1 lower than the EG 2 was 3.2 percent.