Objective:To study the method of cryopreserving rat hepatocytes and double collagen gel culture measurement after its cryopreservation.Methods:Rat hepatocytes,isolated by two-step perfusion with collagenase using an extra corporeal perfusion apparatus,were cryopreserved in double collagen gel with culture medium added by epidermal growth factor(EGF).The expression of cell function and cellular morphology were examined during culture.Results:The hepatocytes cryopreserved in double collagen gel concluding EGF showed good morphology and biological characteristics.After thawing,the MTT metabolism and protein synthesis of hepatocytes in sandwich ± EGF groups were better than those in control group.And the morphology and function of hepatocytes in sandwich group was better than that in EGF group(P < 0.05).Conclusion:Double collagen gel culture can keep hepatocyte’s activities.Thawed hepatocytes can be cultivated with collagenous matrix,which provides an environment that more closely resembles that in vivo and maintain the expression of certain liver-specific function of hepatocytes. Objective: To study the method of cryopreserving rat hepatocytes and double collagen gel culture measurement after its cryopreservation. Methods: Rat hepatocytes, isolated by two-step perfusion with collagenase using an extra corporeal perfusion apparatus, were cryopreserved in double collagen gel with culture medium added by epidermal growth factor (EGF). The expression of cell function and cellular morphology were examined during culture. Results: The hepatocytes cryopreserved in double collagen gel concluding EGF showed good morphology and biological characteristics. After thawing, the MTT metabolism and protein synthesis of hepatocytes in sandwich ± EGF groups were better than those in control group. And the morphology and function of hepatocytes in sandwich group was better than that in EGF group (P <0.05) .Conclusion: Double collagen gel culture can keep hepatocyte’s activities. Hawed hepatocytes can be cultivated with collagenous matrix, which provides an environment that more closely resembl es that in vivo and maintain the expression of certain liver-specific function of hepatocytes.