Abstract: In the thesis, the influences of concentration, shearing, time in hot water, pH changing, freezing-thawing, concentration of salt ionic, microwave, ultrasonic to viscosity of laver polysaccharides were studied. The result showed that the viscosity of laver polysaccharides solution enhanced along with the concentration enhancing, the viscosity was 15.5mPa·s when concentration reached to 1%, it was non-Newton fluid,and the solution had pseudoplasticity. The best temperature of laver polysaccharides dissolved in hot water was 60℃, 1h. pH changing, freezing-thawing, antiseptic, short time treat with micro- wave and ultrasonic had little effect on the fluid of laver polysaccharides. Laver polysaccharides had better stabilization of resisting salt ionic decompounds. The diaphaneity of the solution was 2.209, and its solubility in cold water was 34.29%. Laver polysaccharides had little synergy with locust bean gun, carrageenan and konjak gum.

Key words: Porphyra haitanensis, polysaccharide, rheological property