Physiological effects in SAM P6 and R1 by administration of Cervus cornu, Astragali Radix, Rehmanniae Radix, and Angelicae Radix extracts were screened to know in vivo activities of each extracts. We measured complete blood cells (CBC) such as RBC, HGB, and HCT using coulter`s method. Plasma concentrations of albumin, glucose, alkaline phosphatase, calcium, creatinine, inorganic phosphate, urea and total iron ere also analyzed using biochemical clinical autoanalyzer. Plasma concentrations of cortisol, total T₃, and total T₄ were measured by chemiluminescent immunoassay methods. At 12 weeks after birth, Cervus cornu or Astragali Radix or Rehmanniae Radix extracts were given 5 g/Kg/day p.o. for 0, 7, 14, 21, and 30 days each in both SAM R1 and SAM P6. Angelicae Radix study was done the same as the others except the mice were 16 weeks after birth. The RBC, HGB, and HCT levels after administration of Astragali and Rehmanniae were elevated in SAM R1, but those in Cervi study were increased in SAM P6 the most. Decreases in alkaline phosphatase concentration of SAM R1 and P6 after Cervi administration were detected. Total plasma iron concentration was decreased by Angelicae administration in SAM P6. In general, Angelicae and Rehmanniae stimulate increases in cortisol, but total T₃ and T₄ levels were also elevated by all these extracts. In conclusion, these herval medicine extracts help hematopoiesis in SAMs through probably different mechanisms.