Growth of Spirulina platensis LN1 was observed using eight different media consisting of different combinations of Lonar lake water, N, P and K and Zarrouk medium composition under different incubation periods. Medium II was suitable on 9th day of incubation and medium III was suitable on 15th day of incubation for its growth whereas, 12th day of incubation was shown to be suitable for its growth in remaining media. Optimization of growth of Spirulina platensis was observed at 350C temperature and pH 10. Carotenoids of Spirulina platensis were also analysed.