Abstract: Objective: Extracting nutritional material of Chlamys farreri with water-extraction method, and determining the content of its polysaccharide, taurine and choline. Analysing the relationship between the extraction rate of nutritional material and the content of polysaccharide, choline and taurine. Methods: Ultrasonic wave to break tissue, water extraction to get Chlamys farreri nutritional material; phenol-sulfuric acid colorimetry to analyse polysaccharide; formaldehyde - acetylacetone colorimetry to analyse taurine; reinecke salt precipitation colorimetry to analyse choline. Results: The highest rate of water- extraction material is 23% (broken by ultrasonic wave;1g tissue:30 ml water).The polycsaccharide content of nutritional material by water extraction is 3.60%～15.09%, the taurine content is 1.130%～1.252% and the choline content is 0.31%～0.38%. Conclusions: The extraction rate of nutritional material has relation with the different kinds of extraction conditions, but no relation with contents of polysaccharides, cholinergic and taurine.

Key words: Chlamys farreri, water extraction, taurine, choline, polycsaccharide