Abstract: The experiment was conducted to study the effects of compound acidifiers on growth performance and gastrointestinal pH value in yellow-feathered broilers. One hundred and sixty one-day-old yellow-feathered broilers were randomly allocated to 4 experimental groups with 4 replicates of 10 broilers each. All treatment groups were fed dietary acidifiers 0%, 0.2%, 0.5%, 0.8% in the basal diet composed of lactic acid, citric acid and fumaric acid. The trial lasted for 56 days. The results showed that pH value of glandular stomach, gizzard, duodenum, jejunum, cecum and feed to gain ratio were decreased and average daily gain was increased by different levels of compound acidifiers. The pH value of duodenum and cecum at 42-day-old were significantly decreased (P<0.05) and average daily gain at 1-56 days was significantly increased (P<0.05) by added 0.8% compound acidifiers and feed to gain ratio at 28-42 days was significantly decreased (P<0.05) by added 0.5% compound acidifiers. It indicated that compound acidifiers could improve gastrointestinal pH value and growth performance in yellow-feathered broilers and the optimal supplementation of compound acidifier was 0.15 %.