To evaluate effects of A639G of the IGFBB2 gene on meat yield traits in Tau Yang chicken, 152 commercial broilers from two different lines (CTU-BTD1 and CTU-LAD1) were slaughtered at 13 weeks old. Broilers were genotyped using PCR-RFLP/Bsh12361 and carcass traits of interest were measured. Studied polymorphism exhibited a insignificant effect on all meat yield traits. However, a significant effect on breast length (P=0.043), leg weight (P=0.007), shank length (P=0.001) and breast muscle weight (P=0.046) was found in interaction between genotype and two male lines. The study shows that the A639G polymorphism has no strong effect on the meat yield traits in Tau Yang chicken.