Cassava pulp (CP) is used as an alternative energy source in animal diets. However, low protein and high fiber contents in CP are limited in poultry diet. Yeast fermentation can improve nutritive value of CP. Thus, this study was conducted to improve nutritive values of CP and evaluate the effects of yeast fermented cassava pulp (YCP) on productive performance of Thai native chicken. CP and YCP were analyzed for chemical composition. EightyPradu Hang Dam aged 7 weeks were randomly distributed in two treatments as follows: control (basal feed) and basal feed with 20% YCP. These findings demonstrated that dry matter, ether extract, ash and gross energy in YCP were not affected by fermentation. However, crude protein in YCP was increased (P=0.017), whereas crude fiber was significantly decreased (P=0.047). Birds receiving YCP diet had no significant different in average daily feed intake (ADFI), average daily gain (ADG) and feed conversion ratio (FCR) and mortality rate in comparison to control (P > 0.05). In conclusion, YCP can be used as the energy source in Thai native chicken diets at 20% without no adverse effect on growth performance.