Based on a lot of animal experiments,scientists have developed two kinds of cryopreservation programme:slow cooling-fast thawing method(two step method),fast cooling-fast thawing method.

• 经过大量动物实验，人们建立了两种冷冻程式：慢速冷冻-快速复温法（两步法）；快速冷冻-快速复温法。