Abstract: Mycosporine-like amino acids ( MAAs) are small, water-soluble compounds serving as screens against ultraviolet radiation. To maximize the extraction of MAAs components from Gloiopeltis furcata, we applied the method of ultrasonic extraction with methanol as solvent to determine the optimum range of ultrasonic temperature, ultrasonic time, liquid-solid ratio, methanol concentration and extraction times by a series of single factor experiments. Then we optimized the extraction process of MAAs compounds from G. furcata by response surface methodology. The conditions optimized by Box-Behnken design were ultrasonic temperature 41 ℃, extraction for 81 min, liquid/ solid ratio of 67 mLg- 1 and methanol concentration12%. Under this condition, the expected extraction rate of MAAs was 1.311 5 mgg-1 and the actual extraction rate was 1.306 4 mgg-1 .