旧破产法对破产宣告前特定期间内债务人的行为实行绝对无效制度,存在很大弊端。新破产法将债务人的行为分为实际欺诈行为、推定欺诈行为和优惠行为三类。实际欺诈是债务人故意实施的减少责任财产的行为,维持适用无效制度。对于在危机期间内减少责任财产的推定欺诈行为、对个别债权人进行清偿或提供财产担保的优惠行为则可以由破产管理人撤销。 The old bankruptcy law has a great drawback to the system of absolute nullity of the debtor’s behavior within a specific period before the bankruptcy declaration. The new bankruptcy law divides the debtor’s behavior into actual fraud, presumed fraud and preferential behavior. The actual fraud is deliberately implemented by the debtor to reduce the responsibility of property, to maintain the application of invalid system. For presumed fraud that reduces responsible property during a crisis, the liquidation of individual creditors or the provision of property security can be revoked by the insolvency administrator.