Abstract: Objective:The aim of this study was to determine the chemical compositions and growth properties of Synechococcus sp. PCC7002 (Synechococcus) and thus to provide basic data for development and utilization of microalgae food resource. Method:Synechococcus was cultured,separated and dried to obtain microalgae powder in the lab. Nutiention components were measured by chemical and instrumental,e.g. atomic absorption spectrum,high performance liquid chromatography and gas chromatography-mass spectrometry,analysis methods. Results:Rapid fission speed was detected on Synechococcus with the maximum specific growth rate of 1.023/d. Synechococcus was demonstrated to contain high protein (65.79%) with all essential amino acids,low fat and carbohydrate content (8.21% and 9.30%,respectively),and quite high ash (13.23%). Further analysis showed low poly unsaturation fatty acids (5.60%),high phycocyanin (15.81%) and various minerals and vitamins in Synechococcus. Our results evidenced that the nutritional quality of Synechococcus was comparable with that of Spirulina and Chlorella. Conclusion:Synechococcus was a promising sources for food material,especially for functional or special medical purposes.