The freezing of bovine embryos is a biotechnology applied to animal reproduction of this species, whose benefits is already a reality. The aim of this paper is to show aspects of great importance for freezing bovine embryos. Definition of freezing, freeze benefits of bovine embryos, freezing disadvantages of bovine embryos, variables to be taken into account for the success of the freezing of bovine embryos, cryoprotectants, a cryoprotectant functions: where the following described, conservation methods bovine embryos, conventional methods in the slow freezing of embryos, labeling straws in the freezing of bovine embryos, embryo thawing techniques, and crioinjuria One-step method.