The invention discloses a method for online mining flash process difference phenomenon optimal refreshing. The method aims at monitoring the minimum refreshing frequency capable of being supported byall flash blocks in real time to reduce the refreshing times. For a traditional refreshing strategy, according to the wipe times, the refreshing frequencies are selected for all the flash blocks. Theprocess difference indicates that all the flash blocks can support different wipe times, and therefore a traditional refreshing method can cause much unnecessary refreshing. Accordingly, the real reliability of the flash blocks is monitored in real time so as to judge storage time capable of being supported by the flash blocks, and then the minimum refreshing frequency which can be supported is selected so as to reduce unnecessary refreshing work. In addition, if the storage time of the data is short, the refreshing operation can be skipped. According to the condition that the storage time ofthe data is distributed to the flash blocks capable of providing longer storage time, the refreshing work is further reduced. According to the method, redundant refreshing operations are reduced, andthen the flash service life is obviously prolonged and the flash performance is obviously improved.