Abstract:This paper reports the in-door culture technique of Spirulina platensis -strain 6. The optimum temperature is between 26-30˚C. The biomass varies with the intensity of light. By using Pinevitch culturing method, the optimum development of strain 6 is at 1/2 concentration. Because it contains less cellulose, therefore, it can be an ideal food for sea-animal of rarity food. It is also a cold resistant strain.