Objective:Adopting statistical method to establish differentiating equation for TCM syndrome types of aplastic anemia（AA）

and to probe the relationship between T-cell CD

45 RA/RO and TCM syndrome types.Methods:Immunological indexes of peripheral blood were determined in 34 cases of AA and 34 healthy persons with flow cytometry

and classification of TCM syndromes was carried out in the patients of AA.Results:The most significant 5 indexes screened such as CD

45 RA

+

absolute value

constituted the differentiating equation of classification of AA syndromes

with the total correct differentiating rate of 76.5%. CD

8

+

CD

45 RO

+

expression（%） in all the AA syndrome types increased significantly as compared with healthy control group（P

<

0.05 or P

<

0.01）.Conclusion:CD

8

+

CD

45 RO

+

（%） expression in AA patient increases significantly

confirming that after abnormal activation

T-cells in AA patient transform as memory T-cells

and further lead to immunologic pathogenic mechanism of bone marrow exhaustion

indicating that TCM syndrome classification has a definitely objective substance basis. The obvious changes of CD

45 RA

+

absolute value in the syndrome classification can be used as an objective index for TCM syndrome type of AA.