Objective taking advantage of Micro-Raman spectroscopy technology , samples of inkpad seals were impressed with 10 different brands of inks. To analysis the factors of paper，temperature and heat condition by relative area value（I）of characteristic peaks with 1089 cm^-1 and 1235 cm^-1 in Raman spectrum, in order to discuss the relation between relative area value （I） and dating of inkpad seals. The relative area value (I) showed a regular change with time, especially the stamp of impression in the near time . Micro-Raman spectroscop is a useful method  with accurate, non-destructive properties to determine the formation time of inkpad seals.