高速投射物伤后血液流变学障碍，是伤后许多严重并发症发生的重要原因之一。本研究观察了犬双后肢高速投射物伤及股动脉快速放血后７２小时内静脉血红细胞比积的变化；采用结扎与不结扎双侧股动、静脉的方法比较了致伤瞬间的血流动力学因素对伤后红细胞比积的影响；并用脐静脉体外灌流的方法，观察了流体动力学因素对血管内皮的损伤作用。实验证明，高速投射物伤后流体扰动有可能造成广泛的血管内皮细胞损伤，使血浆外渗，从而造成伤后红细胞比积的增高。 High-speed projectile material damage after hemorrhagic disorders, is one of the important reasons for the occurrence of many serious complications after injury. In this study, we observed the change of hematocrit within 72 hours after the high-speed projection of hind limbs and rapid blood-letting of femoral artery. Compared with the bilateral femoral artery and vein without ligating, we compared the transient hemodynamic Learning factors on the impact of hematocrit after injury; and perfusion with umbilical vein in vitro methods to observe the hydrodynamic factors on vascular endothelial injury. Experiments show that high-speed projectile fluid injury may result in a wide range of vascular endothelial cell damage, extravasation of plasma, resulting in increased hematocrit after injury.