Abstract: Abstract: The NCⅡ design was used to carry out incomplete diallel crosses between three genetic improved Ga waxy inbred lines as paternal and eight waxy inbred lines as maternal. The main agronomic traits were identified in 24 hybrid combinations to analyze combining ability of main agronomic characters in Ga waxy inbred lines. The results showed that the difference of general combining ability (GCA) and special combining ability (SCA) for agronomic traits of paternal and maternal were highly significant. The Ga waxy inbred lines had good combining ability effects. The Ga inbred line CM327 had higher GCA effects and its hybrid combinations had obvious advantages in many traits such as yield, ear height and number of kernels per row. The Ga inbred line CM327 had good potential in heterosis utilization. The breeding and application of Ga waxy inbred lines were in favor of germplasm amplification and heterosis utilization in waxy corn.