The study aimed to discuss the technology conditions of extracting fucoidin from G.tenuistipitata and the physicochemical property of extract.The influences of acid concentration,time,material ratio and temperature on fucoidin extraction rate were investigated by single factor experiment and orthogonal experiment and the range and variance analyses were conducted.The optimum process conditions of extracting fucoidin from G.tenuistipitata by acid method were as follows: extracting at 90 ℃ for 2.5 h with 0.17...