OBJECTIVE： To study the improvement effect and mechanism of Chuanju zhitong capsules （CZC） on migraine model rats. METHODS： SD rats were randomly divided into normal group， model group， chemical drug positive control group （Zolmitriptan tablet， 0.004 05 g/kg）， TCM positive control group （Compound yangjiao capsule， 4.32 g/kg）， CZC high-dose， medium-dose and low-dose groups （1.6， 0.8， 0.4 g/kg）， 10 rats in each group. All rats were relevant medicine intragastrically once a day， for successive 5 days. 30 min after last medication， except for normal group， rats in other groups were given glyceryl trinitrate subcutaneously （10 mg/kg） via head and neck to induce migraine model. The behavior changes of rats were evaluated using the times of scratching head as indexes within 2 h after modeling （30 min as a period of time）. 4 h after modeling， hemorheological parameters as whole blood viscosity （low-shearing， medium-shearing， high-shearing）， plasma viscosity， erythrocyte aggregation indexes and erythrocyte rigidity indexes were determined by automatic hemorheology instrument. The levels of NO， NOS， ET-1， CGRP in serum and the levels of  5-HT， 5-HIAA， DA and NE in cerebral tissue were determined by ELISA. RESULTS： Compared with normal group， the times of scratching head was increased significantly in model group at different periods （P＜0.01）. The serum levels of NO， NOS and CGRP were increased significantly （P＜0.01）， while ET-1 level was decreased significantly （P＜0.01）. The levels of 5-HT， DA and NE in cerebral tissue were decreased significantly （P＜0.01）， while 5-HIAA level was increased significantly （P＜0.01）. Whole blood viscosity （low-shearing）， plasma viscosity， erythrocyte aggregation index and erythrocyte rigidity indexes were increased significantly （P＜0.05），plasma viscosity were decreased significantly （P＜0.05） . Compared with model group， the times of scratching head were decreased significantly in TCM positive control group （0-120 min）， TCM positive control group （60-90 min）， CZC high-dose （30-120 min） and medium-dose （60-90 min） groups （P＜0.05 or P＜0.01）. The whole blood viscosity （low-shearing） and erythrocyte aggregation indexes of TCM positive control group， CZC high-dose and medium-dose groups were decreased significantly （P＜0.05 or P＜0.01）； the serum levels of NO， NOS and CGRP in chemical drug positive control group and CZC high-dose and medium-dose groups were decreased significantly （P＜0.05 or P＜0.01）， while the serum level of ET-1 was increased significantly （P＜0.01）； the levels of 5-HT， DA and NE were increased significantly in cerebral tissue （P＜0.05 or P＜0.01）， while the level of 5-HIAA was decreased significantly （P＜0.05）. CONCLUSIONS： The improvement effect of CZC on migraine model rats is associated with decreasing the serum levels of NO， NOS and CGRP and increasing the levels of 5-HT， DA and NE in cerebral tissue.