Because of the importance of medicinal plants in traditional medicine, and its undeniable fact that herbal medicine play a corner stone in the health care in a very large section of population all over the word. Phytochemical studies carried out on various Ranunculus species revealed different secondary metabolites groups. The preliminary screening of Ranunculus arvensis showed the presence of carbohydrates, protein and amino acids, glycosides, phenolic compounds, steroids, di and tri terpenes, coumarins and flavanoids. And in order to know the biological activity of the crude medicinal plants, we are examining its activity against variety kinds of germs. The results investigated to have in interesting activity antifungal. But the study is necessary to complete by the studies identified bioactive molecules.