Abstract: Objective To compare the two quick-freezing freezers in plasma storage,shorten freezing time of plasma and improve the freezing effect. Method Twenty five bags of 200 mL fresh plasma were weighed and evenly divided into two bags with labels,synchronously placed in the MBF-21 plate plasma machine and the YCS-I convection blood component machine,and then thawed to detect the contents of FⅧ and Fbg. The temperature probe simulating bag was used to monitor the quick freezing temperature changes of the two freezers. Result The content of FⅧ in freshly frozen plasma of the same amount was significantly higher than that in forced air convection freezer （P<0.01）. There was no significant difference in Fbg content （P>0.05）. Compared to the forced convection freezer,flat-panel freezer temperature dropped faster. Conclusion The flat-plate quick-freezing machine is superior to the forced air convection type quick-freezing machine in fresh plasma freezing.

Key words: Plasma quick freezing machine, Fresh plasma, Cold sedimentation, Quick freezing