Abstract: In view of problems with Soxhlet extraction for soluble organic matter in rocks, improvements were made on Soxhlet extractors. The discontinuous extraction of Soxhlet method on rocks with solvent is changed into continuous extraction of rocks with solvent. Experiments show that the extracted amounts of claystones, limestones and shales of continuous method for 8hrs were comparable to those of Soxhlet method for 72hrs. The extracted amounts of coal samples with continuous extraction for 24 hours was edual to that of Soxhlet extraction of 100 hours. Therefore the extractive efficiency is increased by 4-9 times. Moreover the data of group analysis show better continuity and comparability than those of Soxhlet methods.