In under developed countries, traditional and herbal medicines including folk medicinal practice scatters to nearly 70% of the population, because of accessibility, affordability and the time tested dependability. They still depend on herbal medicine because of the side effects of most of the modern drugs.The medicinal activities are due to the presence of active principle in them. The plant Psidium guajava (L) belonging to the family Myrtaceae, here in research boo we see preliminary phytochemical screening and Antioxidant activity.