Under the same culture conditions,growth performances and quality characteristics of five strains of Spirulina were studied through analysis of growth parameters and biochemical compositions.Among these five strains,the S3 strain showed a strong advantage in growth performance,of which the growth rate and light use efficiency were 0.11 g /(L · d) and 1.91%,respectively.The content of protein was 57.95%.Compared with other Spirulina strains,the S3 strain had higher flotation activity and higher contents of phycobiliprotein,chlorophyll a and carotenoid.Simultaneity,using the content of protein and growth rate as evaluation indexes,the excellent Spirulina strain S3 was obtained through colligation score.The result indicated that the strain S3 could be selected for large scale cultivation.