Abstract: The structure of compound eyes of Chinese mitten crab Eriocheir sinensis were studied under light microscopes and scanning electron microscopy.The compound eyes contain about 21 000 ommatidia,which is made up of dioptric apparatus,recipient apparatus and catoptric apparatus.The dioptric apparatus contains cornea and crystalline.Cornea produced from corneagenous cells, which are under the cornea, covers the surface of the eyes.Crystalline is formed from material inside crystalline cone cells. Recipient appp...