A Systematic study of plant crude drugs is embraced through the consideration of both primary and secondary metabolites which are derived from the process of metabolism. The primary metabolites such as carbohydrates, proteins, and lipids are used as food for human beings whereas the secondary metabolites such as phenols, alkaloids, flavonoids, lectins, steroids, and saponins are used for therapeutic purposes. The chemical composition of algae varies to some extent based on the growth conditions namely temperature, light, PH, and availability of nutrients. In the present investigation the presence of qualitative and quantitative phytochemicals namely Carbohydrates, proteins, Phenols, and flavonoids were carried out in Blue green alga Microchaete tenera and Green Algae Nitella tenuissima and Sphaeroplea annulina. The estimated carbohydrate rich in Nitella tenuissima (504mg/100gm) as compared to Sphaeroplea annulina (413mg/100gm) and Microchaete tenera, (301gm/100gm). Protein rich in Nitella tenuissima (624gm/100gm) as compared to Microchaete tenera (496mg/100gm).and Sphaeroplea annulina (350mg/100gm) and Phenol rich in Nitella tenuissima (252mg/100gm) as compared to Microchaete tenera, (204mg/100gm).and Sphaeroplea annulina (186mg/100gm).