The application of accelerated solvent extraction (ASE) technique to the extraction of extractable organic matters in source rocks with ASE 200 are discussed by comparing with traditional Soxhlet extraction technique. Based on analytical results of a mudstone sample from northeast China, the effects of dispersion ratio, extraction temperature and pressure conditions on the determination were discussed and the extraction conditions for extracting organic matters in source rocks with accelerated solvent extraction was optimized with dispersion ratio of 8∶3;extraction temperature of