Valonia aegagropila has a very wide geographical distribution and has been widely used to study ion exchange and water potential across biofilms. However , up to this date, it is still only based on collection, and there is no literature on cultivation and utilization. This project intends to establish the growth conditions and analyze the antioxidant capacity of Valonia aegagropila. Not only can provide raw materials for the industry to use, but also prepare for mass production technology. First, we discussed its growth conditions. The results of the experiment were that the optimum temperature is 20 ℃, the light intensity is 3000-6000 lux, the initial cultivation density is 0.25 g, the salinity is 35 psu, and the nutrient salt is sea added with 1 ppm ammonium salt and 0.01 ppm phosphate and culture method are fixed on orchid net (without aeration) as the best culture conditions. After analyzing its antioxidant capacity, we found that the final volume of the crude extract was 94 ml in the room temperature group, 91 ml in the heating group, 89 ml in the high temperature and high pressure group, and 92 ml in the liquid nitrogen group. Regardless of the total sugar content (1.69±0.03 mg/ml glucose), total phenol content (56.62±0.51 μg/ml gallic acid), reducing power (30.59±0.93 μg/ml vitamin C), the ability to scavenge superoxide anion (40.02±1.25%) and capture DPPH free radicals (70.55±0.91%) are the best in the high temperature and high pressure group. Only the ability to chelate ferrous ions is the best in the room temperature group (82.65±0.55%). We found that some of its antioxidant properties are very good, and it is a good, healthy and safe antioxidant material.