This research studied the concentration of the extract from the leaves of Ming Aralia that bacteria Staphylococcus aureus best. Preparation of extracts from the Ming aralia, using water as a solvent for concentrates that have been sterilized at 121° c for 15 minutes. Compared with the extracts from the leaves Ming Aralia non sterile leaves, Ming quantity Aralia 0.125 0.25 0.5 1 g, and ต่อมิล urologist. Test of inhibition S infections. Aureus found that extracts from the leaves Ming Aralia non sterile at 0.5 g / ml with the ability to inhibit the S infections. Aureus best, followed by 0.25 1, and 0.125 g / ml, respectively. With the magnitude of inhibition at 5.33, 4.67, 2.33, 1.00 mm, respectively, and found that the Ming Aralia leaf extracts through disinfection by heat S. aureus infection can not be suppressed.