25 healthy rabbits were allocated randomly into five equal groups. The rabbits in four experimental groups were administered with decoctions of giant knotweed rhizome (GKR, rhizoma polygoni cuspidati), safflower (SF, flos carthami), red sage root (RSR, radix salviae miltiorrhizae) and chuanxiong rhizome (CXR, rhizoma Chuanxiong) by gastrogavage, respectively, in control group, physiological saline, once a day for seven successive days. After the last administration, all rabbits were intravenously injected with 10% macromolecular dextran to induce blood stasis. The blood samples of all rabbits were collected before the first administration, at 2 h after the last administration and 1 h after injection of dextran, respectively for determination of hemorheologic parameters by MVIS-2035 hemorheology auto-analyzing system.