Effects of nutritional requirements for superoxide anion scavenging activity and reducing power by a newly screened Grifola frondosa TFRI1073 were studied in submerged cultures. The results clearly showed that the culture medium significantly affected superoxide anion scavenging activity and reducing power. In addition, both superoxide anion scavenging capability and reducing power were found to be greatly affected by varying the carbon source, the nitrogen source, the growth factor, and the mineral elements. The best superoxide anion scavenging activity could be obtained when the medium compositions (carbon source, nitrogen source, growth factor, and the mineral elements) were sucrose, ammonium chloride, nicotinic acid, $K_3PO_4$, and $CuSO_4$; while a maximal reducing power could be achieved when the medium composition setting as: xylose, arginine, ascorbic acid, $K_2HPO_4$, and $MgSO_4$. From a series experiments, the maximal superoxide anion scavenging activity and reducing power were $98.36pm0.59%$ and $0.947pm0.06$ at 100 ${mu}g/mL$, respectively. This study proved that modifying the composition of the medium can dramatically enhance the superoxide anion scavenging ability and reducing power by a newly screened G. frondosa TFRI1073.