This study investigated the bioethanol production from green algae Chlorella vulgaris depending on its carbohydrate-enriched biomass. Four different phosphorous concentrations were employed to stimulate bioethanol production from Chlorella vulgaris. The impact of various phosphorous values on Chlorella vulgaris growth rate as well as primary product (carbohydrate) were evaluated. High performance liquid chromatography was utilized in this work. The stationary phase was identified as day14, 12, 10 and 6 in treatments 6, 4, 2 and g/L, respectively. The findings suggest that the treatment without phosphorous addition had the highest record of carbohydrate content (22.64% dry weight) as well as highest bioethanol yield (20.66% dry weight). It was also found that at 0g/L treatment, the growth rate was the highest with 0.75 (day-1) while recoded the lowest at 0.42 with at 6 g/L. Finally, with the treatment of 0 g/L, the shortest doubling time was obtained with 1.35 day while the highest once was observed with 2.4 days at 6 g/L treatment.