Taking advantage of Micro-Raman spectroscopy technology, seal sample for two years are studied by the Raman. The resulting in comparative of suspect and samples which are determined time enable to provide QC matching value.  By the QC matching value, we can identify the relative aging of stamp impression. Micro-Raman spectroscopy technology can be used to identify the aging of stamp impression with the advantages of the convenient preparation of sample and the easy and fast operation of instrument measurement.