Objective:To investigate the molecular mechanism of Fructus Ligustri Lucidi (RLL) in protecting membrane rheo- logical characteristics of red blood cell from free radical damage.Methods:The changes in membrane molecular chemical structure and their fluidity after free radical attacking for 30 minutes were observed and compared to that of protected group by RLL.Results:In the RLL group:(1) The productive rate of free radical lowered for at least 64% in average; (2) The membrane elastic shear modulus increase...