Although the genetically modified crops have been cultivated in the open field in some countries, the concerns on the food safety and ecological environment still exist. The genes can be transferred from genetically modified (GM) crops to non-GM crops in the field or to their relatives by the pollen flow. The effective measure to avoid the pollen flow from GM crops to non-GM crops is keeping an isolation distance. The objective of this report is to review the behavior of gene flow in oilseed rape and the model related to the isolation distance and cross-pollination rate. The information can be the reference of minimizing the gene flow of GM oilseed rape.