An experiment (Exp) was conducted to determine the effects of 2 organic axit products (Menacid and Poulacid) in separate and mixture in diets on growth performance and intestinal healthy of 720 Tam Hoang chickens. The experiment was conducted with 6 treatments and 3 replications in a two factorial design. Each replication was a pen with 20 chickens/pen.The first factor was treatment, the second factor was gender (male and female).The treatments were:1/ ĐC: Basal diet (BD) without any organic axit product supplementation; 2/ M0.8: BD + 0.8 g Menacid /kg feed; 3/ M1.0: BD + 1 g Menacid /kg feed; 4/ P1.0: BD + 1 g Poulacid/kg feed; 5/ P1.5: BD + 1.5 g Poulacid /kg feed; 6/ MP: BD + 0.5 g Menacid + 1g Poulacid/kg feed. Results showed that the average daily gain (ADG) of chickens at ĐC (16.9 g/head/day) was lowest, and the highest was found in M0.8 (18.3 g/head/day) and MP (18.2 g/head/day). Average daily feed intake (ADFI) were no change in supplemented diets to compare with control diet. Therefore, feed conversion ratio (FCR) of chickens fed M0.8 (2.8 kg feed/kg gain), M1.0 (2.95 kg feed/kg gain) and MP (2.97 kg feed/kg gain) were better than that in ĐC (3.1 kg feed)/kg gain). The males gave higher weight gain than females and consumed more feed, but the FCR was not significant difference. The density of Lactobacillus and Salmonella. spp bacteria were not detectable in chicken feces at 42 and 70 days of age, but E.coli and Clostridium perfringens in chicken feces were high. The density of E. coli and Clostridium perfringens in the feces of chickens in supplemented treatments were reduced gradually, especialy E.coli was highest at 42 and 70 days of age were in chickens fed ĐC, the lowest were in chickens fed P1.5 and MP; Clostridium perfringens was highest in chickens fed Cont and lowest in chickens fed M0.8 diet. Mortality rates were highest in ĐC (15%) and lowest were in M0.8 (10%) and MP (10.3%). In conclusion, supplementation Menacid at 0.8 g/kg feed and mixed Menacid and Poulacid in Tam Hoang chicken diets tended to improve weight gain and feed conversion ratio, and reduce E.coli and Clostridium perfringens density in the feces, thus reducing mortality compared to control and Poulacid supplementation.