Objective:To explore the relationship of hairs changes with blood deficiency and testify the clinic significant of the theory of “bair being surplus of blood”.Methods:Observe patients with blood deficiency and their abnormal hair,and statistic data with regress analysis,x 2 analysis and T test.Results:The degree of hairs abnormity correlate directly with blood deficiency;the occurrence rate of the hairs abnormity is higher than the control group obviously;the degree of the hairs abnormity also has a significant difference between case and control groups.The results prove that the theory of hair “being surplus of blood” is right.