Analysis of genetic model on seed dormancy (SD) was conducted with a set of recombinant inbred lines (RILs) derived from a rice cross of a variety named ‘996’ with weaker SD and a variety named ‘4628’ with stronger SD. The seed dormancy in two consecutive years was measured with the germination rate from the population seed harvested in that respective period. Genetic analysis showed that seed dormancy in the crossed generation of ‘996’ and ‘4628’ was controlled by four major genes, three equal additive-polygenes additive-epistasis model in 2011, while it was controlled by two of major genes equal additive-polygenes additive epistasis model in 2012. The test results in two consecutive years showed that the heredity of seed dormancy was controlled by four major genes plus polygenes, which mainly governed by major genes.