Abstract: To investigate the different volatile compounds in two edible parts ( hepatopancreas and gonad) of raw and cooked female Chinese mitten crab ( Eriocheir sinensis) cultured in Yangcheng Lake, they were extracted by a new type material ( MonoTrap) and analyzed by gas chromatography- mass spectrometry ( GC- MS) . Totally 74 volatile compounds were identified.The peak areas were analyzed by significant analysis, and then the odor-active compounds were selected based on ROVA values. There was a significant difference between the volatile compounds of hepatopancreas and gonad. A large number of aldehydes, ketones, alcohols, furans and N-containings were produced in steaming process. Trimethylamine, nonanal, decanal were the main odor- active compounds in raw /cooked hepatopancreas and gonad, while 3- methylbutanal and octanal were only found in cooked samples. Also, 2- methylbutanal was the main odor- active compounds only found in cooked hepatopancreas.