Abstract: The development history and the recent advances of frozen boar sperm at home and abroad were summarized. The cryopreservation mechanism on boar sperm was expatiated briefly. The factors influencing boar sperm frozen were expatiated from aspects such as diluent, cryoprotectant and its conch., pre-freezing treatment, freezing formulation, induced crystallization, freze rate and thawing. Some problems existing in boar sperm freeze theory and practice were put forward and the solving method were put forward.