In this research, spirulina was imported form Indonesia to Iran. After microscopic evaluation by identification key according to appearance, diameter, length of cell and trichome in liquid and semi-solid media, species had been known as Arthrospira platensis. This microalga has been cultured in laboratory condition throughout 40 days and concentration of cell was calculated in different periods. At first, it was cultured in 350ml containers after that it has been cultured under green house condition and transferred in 1.5 l containers. The best growth showed in 18 day period in 300 ml container that was prepared with 20ml of Spirulina inoculums with 17500 cell/ml concentration, florescent light (40w) with 16hour light and aeration for 24 hours. In this condition concentration of cell was counted by neobar lam 127500 cell/ml. J treatment among 1.5 l containers had maximum concentration about 400000cell/ml. This microalga has been cultured in outdoor with greenhouse condition and when the size and concentration of spirulina was suitable then biomass was harvested and produced dry product of spirulina.