| Kernel rehydration rate is one of the main factors affecting kernel moisture content at maturity in maize. The study used 14 inbred lines from home and abroad, following the complete diallel crossing, and had obtained 182 combinations as materials. By employing AUDDC (Area Under the Dry Down Curve) method, we were respectively carried out the calculation of the kernel dehydration rate at 35～40d, 40～50d, 50d～maturity, 40d～maturity and 35d～maturity after pollination and the genetic analysis. The results indicated that variance of general combining ability of kernel dehydration rate at each development stage for the 14 inbred lines were all reached very significant level, in which the inbred lines LH202 had the smallest effect value at all development stages. Special combining ability variance of 182 combinations at all development stages were also reached very significant level. At each individual development stage, the heredity of kernel dehydration rate was mainly additive effect, and the heritability of kernel dehydration rate at 40d～maturity after pollination was the highest, and could be stable heredity. There were significantly positive correlation among 40～50d, 50d～maturity, 40d～maturity and 35d～maturity after pollination of kernel rehydration rate, and they were also respective significantly positive correlation with kernel moisture content at maturity, and the combinations for the kernel dehydration rate at these stages showed significant positive relation with their parents’. The results will provide theoretical basis for kernel rehydration rate identification and genetic improvement of maize varieties.