Abstract: With Chlorella powder as raw material,the algae polysaccharide was extracted by the method of ultrasonic assisted,then papain and neutral protease were used to hydrolyze alga protein. A kind of health drink was manufactured by adding right amount honey,sugar and citric acid into the filtrate. The optimal extraction condition by orthogonal test was as follows: solid-liquid ratio of 1 ∶ 15( g ∶ m L),p H7.0,extraction temperature of60℃,extraction time 30 min,under which condition,extraction yield of Chlorella polysaccharide was 18.94 mg/g.The optimal condition of hydrolyzing alga protein was as follows: substrate concentration of 100 g/L,the amount of composite enzyme of 12000 U/g,p H6.5,temperature of 55℃. Under which the degree of hydrolysis of Chlorella protein was up to 27.83%.The nutritional health drink was obtained with rich nutrition,unique flavor.