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With the animal model of cerebral ischemia and reperfusion, we conducted experiments on such model to study the effects of Ligustrazine(LZ) and Salvia Miltirrhizae(SM). The results obtained are as follows: (1) The ischemic brain showed hyperperfusion (congestion period) after 10 min reperfusion following 50 min of ischemia, and then entered a delayed hypoperfusion period after 60 minutes reperfusion and afterward the hypoperfusion was remained till the end of 120 min reperfusion. (2) Following 50 min of ischemic insult, ATP and glucose contents in brain tissue were almost depleted and much of lactate accumulated. Although rapid recovery of energy metabolism occurred within 60 min of reperfusion, a secondary deterioration emerged at 120 min of reperfusion. (3) Apparent brain edema occurred after cerebral ischemia and its further development was observed at the early stage of reperfusion owing to congestive response. Despite the degree of brain edema alleviated obviously after 60 min of reperfusion, the condition become worse at 120 min of reperfusion, which was accompanied by secondary metabolic deterioration. (4) Experimental results showed that LZ and SM could significantly elevate rCBF during the delayed hypoperfusion period, and limit the development of secondary deterioration in energy metabolism and brain edema after 120 min of reperfusion. (5) Notably, LZ and SM had no significant effect on MABP when these two Chinese drugs manifested their therapeutic actions in the animal model of cerebral ischemia.(ABSTRACT TRUNCATED AT 250 WORDS)